SK-2296: Release/25.9.14

[skyflow-shravan]

This PR modifies insert method to utilise sessions provided by requests library.

Why

• On larger scale, the simple requests.post leads to choking and connection errors.
• therefore, we needed to optimise connection pooling by using sessions instead.
• We also needed to add retries for any connection related and 500 errors.

Goal

• Optimised connection pooling by utilising sessions
• Retry any connection related and/or 500 errors.

Testing

• Tested the changes manually
• Load tested the changes for 2M records using locust.

[github-actions]

✅ Gitleaks Findings: No secrets detected. Safe to proceed!

[github-actions]

Semgrep Findings: Issues with Error level severity are found (Error is Highest severity in Semgrep), Please resolve the issues before merging.