TST/CLN: remove test_slice_ints_with_floats_raises
- [x] closes #20915
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [n/a ] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25277?src=pr&el=h1) Report
> Merging [#25277](https://codecov.io/gh/pandas-dev/pandas/pull/25277?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/3ab9318f2c0806a7fd38d4b4dc47bf6c3803c1e7?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25277/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25277?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #25277   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files         173      173           
  Lines       52831    52831           
=======================================
  Hits        48458    48458           
  Misses       4373     4373
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.28% <ø> (ø)` | :arrow_up: |
| #single | `41.72% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25277?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/25277?src=pr&el=footer). Last update [3ab9318...1a42f75](https://codecov.io/gh/pandas-dev/pandas/pull/25277?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/25277?src=pr&el=h1) Report
> Merging [#25277](https://codecov.io/gh/pandas-dev/pandas/pull/25277?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/3ab9318f2c0806a7fd38d4b4dc47bf6c3803c1e7?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25277/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25277?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #25277   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files         173      173           
  Lines       52831    52831           
=======================================
  Hits        48458    48458           
  Misses       4373     4373
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.28% <ø> (ø)` | :arrow_up: |
| #single | `41.72% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25277?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/25277?src=pr&el=footer). Last update [3ab9318...1a42f75](https://codecov.io/gh/pandas-dev/pandas/pull/25277?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks @simonjayhawkins 