Doing flush for pending writes on rename file

[vadlakondaswetha]

Description

Doing this only when streaming writes is enabled to be safe. Will do it later for non-streaming writes.

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 37.83784% with 23 lines in your changes missing coverage. Please review.

Project coverage is 75.20%. Comparing base (45a8f47) to head (3b116fd).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/fs/fs.go	37.83%	22 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2958      +/-   ##
==========================================
- Coverage   75.28%   75.20%   -0.09%     
==========================================
  Files         125      125              
  Lines       17669    17734      +65     
==========================================
+ Hits        13302    13336      +34     
- Misses       3805     3833      +28     
- Partials      562      565       +3     

Flag	Coverage Δ
unittests	75.20% <37.83%> (-0.09%)	⬇️

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