Add new method of generating key for GBEK

[damccorm]

This will use the following process to introduce some extra entropy into the generated key:

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[codecov]

Codecov Report

❌ Patch coverage is 86.20690% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.14%. Comparing base (b20ccbf) to head (8140976).
⚠️ Report is 48 commits behind head on master.

Files with missing lines	Patch %	Lines
sdks/python/apache_beam/transforms/util.py	86.20%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #36891      +/-   ##
============================================
+ Coverage     55.07%   55.14%   +0.07%     
  Complexity     1667     1667              
============================================
  Files          1063     1063              
  Lines        166396   166765     +369     
  Branches       1199     1199              
============================================
+ Hits          91638    91963     +325     
- Misses        72582    72626      +44     
  Partials       2176     2176              

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[Amar3tto]

@damccorm What is the status for this?
Should we update the milestone?

[damccorm]

I think we should try to get this in if we can, it is a really important patch for making sure that our GBEK story is complete, and that is probably worth delaying the release a couple of days if needed.

It still needs a review and I need to get the permissions right for GitHub Actions (this is the only thing causing suites to fail)

[damccorm]

R: @Abacn since I think you reviewed pieces of this initially.

[damccorm]

Feel free to ignore the failing permission causing test failures right now, that is caused by insufficiently a privileged GHA runner, in general tests are passing locally and I will address it before merging (should require no code changes)

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[Abacn]

Had a pass for Java change, also submitted one review comment for Python because triggering Python tests may need time to iterate.

Will review Python change next, or find a second eyes for Python if needed.

[Abacn]

For Python SDK we have this mechanism to handle optional dependency. Just wondering if it is possible to make gcp secret dependencies optional for Java core as well. Just a side note, not needed for this PR.

[Abacn]

Thanks. Feel free to merge after PostCommit finishing