Temporarily fix pip check failure on xgboost and grpcio

[shunping]

Originally, this PR is to pin pip to version 24.1, so that pip check would not fail on xgboost-1.7.6 and grpcio-1.66.1.

After some attempts, it seems it is a bit inconvenient to enforce pip version, especially inside the venv set up by tox.

Therefore, we decide to make the following changes

1. for xgboost, since we don't have any plan to invest further on it, we are going to remove it from deps. After that, the xgboost related tests in the ML test suite will be skipped. We can put it back in the future if we decide to support xgboost again ([Feature request]: Support XGBoost 2.x #31252) .

2. for grpcio, the failure only occurs on MacOS, so we decide to skip pip check on MacOS until pip check failed on grpcio in macos-arm64 grpc/grpc#37660 is fixed.

#fixes #31285

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[shunping]

Run Python_ML PreCommit 3.8

[shunping]

R: @tvalentyn @Abacn

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[Abacn]

Note that the PR triggered workflow won't run on the change in .github/, which means the passed Python tests / Python Unit Tests (macos-latest, ...) is passed without the changes of .github/workflows/python_tests.yml (and sdks/python/tox.ini) in this PR. Do we still need them?

[shunping]

Note that the PR triggered workflow won't run on the change in .github/, which means the passed Python tests / Python Unit Tests (macos-latest, ...) is passed without the changes of .github/workflows/python_tests.yml (and sdks/python/tox.ini) in this PR. Do we still need them?

Are you sure? I think the tests are run with my changes in .github/, since I see the new tox environment I created for macos is used in the tests. For example:
https://github.com/apache/beam/actions/runs/10821274842/job/30022967680?pr=32432

[Abacn]

ah you are right, I remembered there is this kind of limitation but looks like it does not applies to this specific test. Turns out the limitation applies to pull_request_target but not pull_request trigger

[Abacn]

lgtm for python_test. For dependency change defer to ml owner

[damccorm]

Thanks - lets just try to revert the mac pieces once grpc is ready

[shunping]

Thanks! I have created the task for reverting the mac change #32431.