pantsbuild / pants / 28489169743

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Log the list of tests in a given batch (#21549)

This PR logs the list of test files in a given batch before tests
execute.

The batch listing is logged at `debug` level using a named logger
(`pants.backend.python.goals.pytest_runner`), which integrates with the
existing `--log-levels-by-target` mechanism. To surface it in CI, add to
`pants.toml`:

```toml
[GLOBAL]
log_levels_by_target = {"pants.backend.python.goals.pytest_runner" = "info"}
```

Example output when enabled:
```
09:59:41.68 [INFO] batch of a_test.py:tests and 3 other files contains:
  a_test.py:tests
  b_test.py:tests
  c_test.py:tests
  d_test.py:tests
```

2 of 2 new or added lines in 1 file covered. (100.0%)

93756 of 101001 relevant lines covered (92.83%)

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