Fix PostgreSQL backfill chunking for UUID and string types

[CodewithEvilxd]

Description

Fixed a bug in PostgreSQL backfill where chunking would fail on UUID columns. The issue was that string values weren't being properly quoted in the SQL queries used for chunk boundaries.

What I changed:

• Updated the SQL query functions to check if the column is a string type and quote the values
• Made sure UUID and other string columns work correctly in backfill operations
• Removed the old TODO comment since this is now fixed

This should make backfill work properly with UUID primary keys and other string-based columns.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Code builds successfully
• The logic now quotes string values in SQL queries
• Should work for UUID, text, and other string columns

Screenshots or Recordings

Related PR's (If Any):

[CLAassistant]

All committers have signed the CLA.

[vaibhav-datazip]

Hi @CodewithEvilxd ,
This PR raised with master as base, can you rebase it to staging