Fix whitespace precommit after gradle 8

[Abacn]

Fixes #28756 (comment)

• exclude intermediate build directory. Specifically /beam/build/

Please add a meaningful description for your change here

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[Abacn]

It failed on gradle 8 because the zip src folder includes the python virtualenv folder, explicitly set here (was a workaround of gradle gc behavior):

beam/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy

Line 2957 in 161cd6b

outputs.dirs(project.ext.envdir)

in general we should not include gradle intermediate dir **/build/**

It failed locally for different reason. Beam repo linked to google/docsy : https://github.com/apache/beam/tree/master/website/www/site/themes

For some reason this file is present locally but not on GHA / Jenkins (previously)

[Abacn]

Run Whitespace PreCommit

test passed: https://github.com/apache/beam/actions/runs/6419609343/job/17429832396

[codecov]

Codecov Report

Merging #28845 (8c2600e) into master (161cd6b) will decrease coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #28845      +/-   ##
==========================================
- Coverage   72.22%   72.21%   -0.01%     
==========================================
  Files         684      684              
  Lines      101230   101230              
==========================================
- Hits        73110    73106       -4     
- Misses      26545    26549       +4     
  Partials     1575     1575              

Flag	Coverage Δ
python	82.76% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 3 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[Abacn]

python coverage passed on GHA