CI: Publish test summary
xref #22766 
https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=42&view=ms.vss-test-web.test-result-details has the output from the PR. Filtered to "failed" by default.

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22770?src=pr&el=h1) Report
> Merging [#22770](https://codecov.io/gh/pandas-dev/pandas/pull/22770?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/40dfadd02fa564434323007240d48b57068eea25?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/22770/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/22770?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #22770   +/-   ##
=======================================
  Coverage   92.17%   92.17%           
=======================================
  Files         169      169           
  Lines       50769    50769           
=======================================
  Hits        46798    46798           
  Misses       3971     3971
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.59% <ø> (ø)` | :arrow_up: |
| #single | `42.32% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22770?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/22770?src=pr&el=footer). Last update [40dfadd...9b492d7](https://codecov.io/gh/pandas-dev/pandas/pull/22770?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
