test(general): set cache size limits for metadata repo

[chaitalisg]

The soft limits are set for content cache and metadata cache. This may cause the cache to bloat beyond expectations. Setting hard limits for the size would keep the cache bloat in check, thus reducing the memory needed to required to run the robustness tests over a long time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.21%. Comparing base (cb455c6) to head (2889935).
Report is 181 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3952      +/-   ##
==========================================
+ Coverage   75.86%   77.21%   +1.34%     
==========================================
  Files         470      481      +11     
  Lines       37301    28803    -8498     
==========================================
- Hits        28299    22240    -6059     
+ Misses       7071     4664    -2407     
+ Partials     1931     1899      -32     

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