Enable local build caching for CI builds

[runningcode]

Before #26351, builds had the local build cache enabled for local development builds as well as CI builds. #26351 inadvertenly disabled the local build cache for CI builds. This re-enables it.

You can see in this Gradle Enterprise graph that the local build cache was disabled for CI builds.

Fixes #26776

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[codecov]

Codecov Report

Merging #26784 (39f5c05) into master (809d4b3) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26784      +/-   ##
==========================================
- Coverage   71.98%   71.97%   -0.02%     
==========================================
  Files         747      747              
  Lines      101306   101306              
==========================================
- Hits        72927    72911      -16     
- Misses      26920    26936      +16     
  Partials     1459     1459              

Flag	Coverage Δ
python	80.94% <ø> (-0.03%)	⬇️

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see 7 files with indirect coverage changes

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[damccorm]

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[Abacn]

Flink tests known flake: #21333 not related (this flakiness happens more frequently since then, also), merging for now.