Make default value of enable-hns flag true

[Tulsishah]

Description

• Make default value of enable-hns flag true.
• Remove enableEmptyManagedFolder flag true with enableHNS flag true as it is changing flag value for flat bucket also.
• Rename enableEmptyManagedFolder in dir.go with IncludeFoldersAsPrefixes.
• Removed/Updated all the unit tests for changes.

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - Automated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.07%. Comparing base (51abe5c) to head (1d6e535).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2377      +/-   ##
==========================================
+ Coverage   79.04%   79.07%   +0.03%     
==========================================
  Files         105      105              
  Lines       11577    11577              
==========================================
+ Hits         9151     9155       +4     
+ Misses       1961     1958       -3     
+ Partials      465      464       -1     

Flag	Coverage Δ
unittests	79.07% <100.00%> (+0.03%)	⬆️

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[kislaykishore]

Approving for config changes. Please get the business logic change reviewed from someone in the know.