Fix test in GKE environment

[Tulsishah]

Description

I've implemented a check for HierarchicalNamespace.Enabled to incorporate the HNS flag in end-to-end tests. Older buckets lack this attribute, potentially leading to nil pointer exceptions. To mitigate this, I've added a fix to verify the presence of HierarchicalNamespace.

Alternatively, the GKE team could create a new bucket where the HierarchicalNamespace attribute already defined.

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - Automated and Ran mounted directory script

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.06%. Comparing base (3995bfb) to head (5221a8b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2076      +/-   ##
==========================================
+ Coverage   71.98%   72.06%   +0.07%     
==========================================
  Files         100       99       -1     
  Lines       11207    10863     -344     
==========================================
- Hits         8067     7828     -239     
+ Misses       2806     2706     -100     
+ Partials      334      329       -5     

Flag	Coverage Δ
unittests	72.06% <ø> (+0.07%)	⬆️

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