[Bugfix] Fix createOrReplace Behaviour

[suddendust]

Description

This PR fixes a bug in FlatPostgresCollection#createOrReplace in which for replace cases, it overwrites the unspecified fields with their default values.

Testing

Added integration tests to check for this.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.68%. Comparing base (d112d17) to head (1ea7237).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #276      +/-   ##
============================================
+ Coverage     80.65%   80.68%   +0.03%     
  Complexity     1396     1396              
============================================
  Files           240      240              
  Lines          6871     6882      +11     
  Branches        638      638              
============================================
+ Hits           5542     5553      +11     
  Misses          914      914              
  Partials        415      415              

Flag	Coverage Δ
integration	80.68% <100.00%> (+0.03%)	⬆️
unit	53.18% <0.00%> (-0.09%)	⬇️

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[suresh-prakash]

Nit:

Suggested change

	* INSERT INTO table (col1, col2,, col3, pk_col)
	* INSERT INTO table (col1, col2, col3, pk_col)