TST: Reorganize package_check and skip_if_no_package
`skip_if_no_package` literally just calls `package_check` with no additional decorations and with confusing `*args` and `**kwargs`.  However, `skip_if_no_package` is a better name than `package_check`.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15709?src=pr&el=h1) Report
> Merging [#15709](https://codecov.io/gh/pandas-dev/pandas/pull/15709?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/61f6f6333fb7bb2dedf82736aee6c9878382a06f?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `100%`.


```diff
@@            Coverage Diff             @@
##           master   #15709      +/-   ##
==========================================
- Coverage   91.03%      91%   -0.03%     
==========================================
  Files         143      143              
  Lines       49411    49409       -2     
==========================================
- Hits        44979    44967      -12     
- Misses       4432     4442      +10
```


| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/15709?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/compare/61f6f6333fb7bb2dedf82736aee6c9878382a06f...c6280186db0590202eae9ed6d66f06ef067595e6?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `80.81% <100%> (-0.04%)` | :x: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/compare/61f6f6333fb7bb2dedf82736aee6c9878382a06f...c6280186db0590202eae9ed6d66f06ef067595e6?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :x: |
| [pandas/tools/merge.py](https://codecov.io/gh/pandas-dev/pandas/compare/61f6f6333fb7bb2dedf82736aee6c9878382a06f...c6280186db0590202eae9ed6d66f06ef067595e6?src=pr&el=tree#diff-cGFuZGFzL3Rvb2xzL21lcmdlLnB5) | `93.68% <0%> (-0.34%)` | :x: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/compare/61f6f6333fb7bb2dedf82736aee6c9878382a06f...c6280186db0590202eae9ed6d66f06ef067595e6?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.87% <0%> (-0.1%)` | :x: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/compare/61f6f6333fb7bb2dedf82736aee6c9878382a06f...c6280186db0590202eae9ed6d66f06ef067595e6?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `91.3% <0%> (+0.33%)` | :white_check_mark: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15709?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/15709?src=pr&el=footer). Last update [61f6f63...c628018](https://codecov.io/gh/pandas-dev/pandas/compare/61f6f6333fb7bb2dedf82736aee6c9878382a06f...c6280186db0590202eae9ed6d66f06ef067595e6?el=footer&src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments). thanks!