Reenable cache for Python/Xlang/Yaml templates

[Abacn]

attempt to mitigate #2984 (comment) while avoid issues of stale cache in https://github.com/GoogleCloudPlatform/DataflowTemplates/pull/2962/files#r2495990868

[gemini-code-assist]

Summary of Changes

Hello @Abacn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on optimizing the build process for Python, Xlang, and Yaml templates by re-enabling and refining the Kaniko caching strategy. The core change involves activating the build cache and implementing a weekly rotating cache directory. This approach is designed to enhance build speed by reusing image layers while proactively addressing potential cache staleness, thereby improving the overall reliability and performance of template staging.

Highlights

• Re-enabled Kaniko Caching: Kaniko caching has been re-enabled for Python, Xlang, and Yaml templates to improve build performance and efficiency.
• Weekly Rotating Cache Directory: A new mechanism has been introduced to create a weekly rotating cache directory, aiming to mitigate issues related to cache invalidation and ensure fresh builds when necessary.
• Code Cleanup: Previously commented-out lines related to cache configuration have been removed, cleaning up the codebase.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.40%. Comparing base (efb574a) to head (e4672d4).
⚠️ Report is 33 commits behind head on main.

Files with missing lines	Patch %	Lines
...loud/teleport/plugin/maven/TemplatesStageMojo.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3077      +/-   ##
============================================
+ Coverage     50.26%   50.40%   +0.14%     
+ Complexity     5024     5019       -5     
============================================
  Files           967      970       +3     
  Lines         59271    59585     +314     
  Branches       6459     6499      +40     
============================================
+ Hits          29794    30036     +242     
- Misses        27376    27425      +49     
- Partials       2101     2124      +23     

Components	Coverage Δ
spanner-templates	70.59% <87.37%> (+0.13%)	⬆️
spanner-import-export	68.85% <ø> (-0.17%)	⬇️
spanner-live-forward-migration	80.03% <87.37%> (+0.34%)	⬆️
spanner-live-reverse-replication	77.47% <87.37%> (+0.36%)	⬆️
spanner-bulk-migration	88.25% <87.37%> (-0.09%)	⬇️

Files with missing lines	Coverage Δ
...loud/teleport/plugin/maven/TemplatesStageMojo.java	8.22% <0.00%> (-0.10%)	⬇️

... and 13 files with indirect coverage changes

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[Abacn]

R: @derrickaw