feat: edit experience issue 8 clean

[aboderinsamuel]

Summary

This PR adds support for updating an existing Experience entry using its index (ID) via a PUT request to /resume/experience.

Related Issue

• Edit existing Experience Edit existing Experience #8

What’s Included

• PUT handling on /resume/experience that:
  • Validates the id
  • Validates required fields
  • Updates the experience at the given index
• Refactored response flow to avoid too many return statements (pylint compliance)
• New pytest that:
  • Creates an experience
  • Updates it via PUT
  • Verifies the list reflects the updated values

API Behavior

Request:

[JocelynVelarde]

please resolve the merge conflicts