CLN: remove obsolete scripts
closes #13704
cc @wesm @jorisvandenbossche @TomAugspurger 

speak now or forever hold your peace > speak now or forever hold your peace

speak now or look in the git history :-)

Therefore, big +1 Out of curiosity, does somebody use `find_commits_touching_func.py` ? # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=h1) Report
> Merging [#18181](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/8dac633142daa8d5bcd0cf77ad89b97628d474eb?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18181/graphs/tree.svg?src=pr&width=650&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #18181      +/-   ##
==========================================
- Coverage   91.42%    91.4%   -0.02%     
==========================================
  Files         163      163              
  Lines       50068    50068              
==========================================
- Hits        45776    45766      -10     
- Misses       4292     4302      +10
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.21% <ø> (-0.01%)` | :arrow_down: |
| #single | `40.36% <ø> (-0.06%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.8% <0%> (-0.1%)` | :arrow_down: |
| [pandas/core/indexes/datetimes.py](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZXMucHk=) | `95.38% <0%> (-0.1%)` | :arrow_down: |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=footer). Last update [8dac633...f0130bd](https://codecov.io/gh/pandas-dev/pandas/pull/18181?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
