CI: Unify bazel cache

[snazy]

The bazel build (for the conformance tests) does not depend on the Java version, so there should be only one cache-key for the bazel-cache.

[XN137]

never ran bazel so not sure what files are in there so trusting you it doesnt depend on java version in this case 😅

[codecov]

Codecov Report

Merging #129 (f0d31a3) into main (e7562cc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #129   +/-   ##
=========================================
  Coverage     80.31%   80.31%           
  Complexity     1829     1829           
=========================================
  Files           100      100           
  Lines          7875     7875           
  Branches       1143     1143           
=========================================
  Hits           6325     6325           
  Misses         1033     1033           
  Partials        517      517           

Flag	Coverage Δ
java	80.31% <ø> (ø)

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