replacing gcs.Object with gcs.MinObject in gcs.Listing

[anushka567]

Description

We are fetching only MinObject attributes for reducing list API payload in this PR , creating a gcs.Object using the attributes fetched, converting this gcs.Object to gcs.MinObject , and ultimately , storing minObject in cache for serving listobject requests, the conversion from gcs.Object to gcs.MinObject is redundant.

Hence, in this PR, the gcs.Listing struct is modified to store gcs.MinObject instead of gcs.Object so that attributes fetched can be used to directly populate the minObject and stored in cache.

Link to the issue in case of a bug fix.

NA

Testing details

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

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 77.44%. Comparing base (ede87e1) to head (dedc240).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/gcsx/garbage_collect.go	0.00%	4 Missing ⚠️
internal/storage/bucket_handle.go	42.85%	3 Missing and 1 partial ⚠️
internal/storage/storageutil/object_attrs.go	82.35%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2657      +/-   ##
==========================================
- Coverage   77.56%   77.44%   -0.12%     
==========================================
  Files         109      110       +1     
  Lines       15576    15676     +100     
==========================================
+ Hits        12081    12141      +60     
- Misses       2979     3014      +35     
- Partials      516      521       +5     

Flag	Coverage Δ
unittests	77.44% <95.00%> (-0.12%)	⬇️

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