Fixing redundant updates of session file

[VardhanThigle]

Fixes b/394487678

• Tests pass - Manually ran UI work flows for restore table, convert table, delete and add rules etc and checked that the file is flushed.
• Appropriate changes to README are included in PR - NA

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 46.76%. Comparing base (263e942) to head (c779f80).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
webv2/api/schema.go	0.00%	2 Missing ⚠️
webv2/api/rules.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1006      +/-   ##
==========================================
- Coverage   46.77%   46.76%   -0.02%     
==========================================
  Files         169      169              
  Lines       22950    22951       +1     
  Branches      563      563              
==========================================
- Hits        10734    10732       -2     
- Misses      11610    11613       +3     
  Partials      606      606              

Components	Coverage Δ
backend-apis	46.18% <50.00%> (-0.01%)	⬇️
backend-library	52.91% <ø> (ø)
cli	4.85% <ø> (ø)
frontend	34.29% <ø> (-0.06%)	⬇️

Files with missing lines	Coverage Δ
webv2/primarykey/primarykey_handler.go	86.95% <100.00%> (ø)
webv2/api/rules.go	41.84% <0.00%> (ø)
webv2/api/schema.go	63.58% <0.00%> (-0.05%)	⬇️

... and 1 file with indirect coverage changes

[bharadwaj-aditya]

LGTM