fix: Performance optimisation while getting the Data from DB for chart versions for a particular chart

[manish-agrawal-ai]

Description

Performance issue fix while getting the Data from DB for chart versions for a particular chart :

1. DB query optimised
2. Index created in DB. earlier query plan was using Seq scan which was slow. hence created index to use Index scan

Fixes #2109

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Refactoring

How Has This Been Tested?

by checking the performance of the API

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas