[0.7] [MOD-10559] Decouple the shrinking and growing logic of large containers in Flat and HNSW

[meiravgri]

Backport of #777, backported from main pr: #753

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.70%. Comparing base (40aa744) to head (0b32d85).
⚠️ Report is 1 commits behind head on 0.7.

Additional details and impacted files

@@            Coverage Diff             @@
##              0.7     #780      +/-   ##
==========================================
+ Coverage   95.63%   95.70%   +0.07%     
==========================================
  Files          69       69              
  Lines        4238     4289      +51     
==========================================
+ Hits         4053     4105      +52     
+ Misses        185      184       -1     

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