Delete folder api implementation

[Tulsishah]

Description

Implemented the DeleteFolder API for HNS buckets. For HNS buckets, it will first attempt to call deleteObject. If this results in a "not found" error, it will be ignored, as the object may still exist as a folder within the HNS bucket. A second call will then be made from the control client to specifically delete the folder.

For FLAT bucket the existing flow will hit.

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - Manually tested the flow for deleting folders on HNS bucket as well in FLAT bucket.
2. Unit tests - Added
3. Integration tests - Automated

[codecov]

Codecov Report

Attention: Patch coverage is 27.53623% with 50 lines in your changes missing coverage. Please review.

Project coverage is 73.32%. Comparing base (fabd295) to head (b6ea521).
Report is 1 commits behind head on master.

Files	Patch %	Lines
internal/storage/mock_bucket.go	0.00%	13 Missing ⚠️
internal/storage/fake/bucket.go	0.00%	8 Missing ⚠️
internal/ratelimit/throttled_bucket.go	0.00%	6 Missing ⚠️
internal/monitor/bucket.go	0.00%	5 Missing ⚠️
internal/storage/debug_bucket.go	0.00%	5 Missing ⚠️
internal/fs/inode/dir.go	0.00%	2 Missing and 2 partials ⚠️
internal/storage/caching/fast_stat_bucket.go	0.00%	4 Missing ⚠️
internal/gcsx/prefix_bucket.go	0.00%	3 Missing ⚠️
internal/storage/bucket_handle.go	88.88%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1954      +/-   ##
==========================================
- Coverage   73.65%   73.32%   -0.34%     
==========================================
  Files          97       97              
  Lines       10381    10450      +69     
==========================================
+ Hits         7646     7662      +16     
- Misses       2398     2447      +49     
- Partials      337      341       +4     

Flag	Coverage Δ
unittests	73.32% <27.53%> (-0.34%)	⬇️

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