CLN: clean-up sanitize_array series construction
Some possible clean-up that I encountered when doing https://github.com/pandas-dev/pandas/pull/26848/
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=h1) Report
> Merging [#26979](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/c275dbfcee0fa9644fa2718ad76fd91ca056069b?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/26979/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26979      +/-   ##
==========================================
- Coverage   91.98%   91.97%   -0.01%     
==========================================
  Files         180      180              
  Lines       50760    50754       -6     
==========================================
- Hits        46690    46682       -8     
- Misses       4070     4072       +2
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.57% <100%> (ø)` | :arrow_up: |
| #single | `41.84% <56.25%> (-0.09%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/internals/construction.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL2NvbnN0cnVjdGlvbi5weQ==) | `96.41% <100%> (+0.45%)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `88.88% <0%> (-11.12%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `96.89% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=footer). Last update [c275dbf...1f7c446](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=h1) Report
> Merging [#26979](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/de0867f8bedab9ce7d8d4f46267c4c123ff3166c?src=pr&el=desc) will **increase** coverage by `0.14%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/26979/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26979      +/-   ##
==========================================
+ Coverage   91.84%   91.99%   +0.14%     
==========================================
  Files         180      180              
  Lines       50734    50768      +34     
==========================================
+ Hits        46599    46705     +106     
+ Misses       4135     4063      -72
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.63% <100%> (+0.15%)` | :arrow_up: |
| #single | `41.83% <58.82%> (-0.13%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/internals/construction.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL2NvbnN0cnVjdGlvbi5weQ==) | `96.41% <100%> (+0.35%)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `88.88% <0%> (-11.12%)` | :arrow_down: |
| [pandas/core/internals/blocks.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL2Jsb2Nrcy5weQ==) | `94.38% <0%> (-0.77%)` | :arrow_down: |
| [pandas/core/arrays/integer.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2ludGVnZXIucHk=) | `96.3% <0%> (-0.64%)` | :arrow_down: |
| [pandas/core/dtypes/concat.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZHR5cGVzL2NvbmNhdC5weQ==) | `96.58% <0%> (-0.46%)` | :arrow_down: |
| [pandas/core/internals/concat.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL2NvbmNhdC5weQ==) | `96.48% <0%> (-0.37%)` | :arrow_down: |
| [pandas/core/arrays/sparse.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL3NwYXJzZS5weQ==) | `94.19% <0%> (-0.31%)` | :arrow_down: |
| [pandas/core/internals/managers.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL21hbmFnZXJzLnB5) | `96% <0%> (-0.22%)` | :arrow_down: |
| [pandas/core/indexes/numeric.py](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9udW1lcmljLnB5) | `97.34% <0%> (-0.13%)` | :arrow_down: |
| ... and [26 more](https://codecov.io/gh/pandas-dev/pandas/pull/26979/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=footer). Last update [de0867f...634c820](https://codecov.io/gh/pandas-dev/pandas/pull/26979?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @jbrockmendel ok with this? yep thanks @jorisvandenbossche 