Fix/10505 overlapping api requests

[Ishani-Prajapati]

Description

Fixes #10505

This PR prevents overlapping GitHub API requests when users rapidly perform profile searches or comparisons.

Changes Made

• Added a shared request lifecycle using AbortController and an operation ID.
• Cancels the previous profile search or comparison when a new one starts.
• Propagates the cancellation signal through profile, repository, contribution, and language API requests.
• Prevents stale requests from updating the UI after a newer request has started.
• Prevents intentionally cancelled requests from displaying error messages.
• Stops contribution-data retries when the operation has been cancelled.
• Preserves the existing timeout and retry behavior for genuine failures.

Result

Only the most recent search or comparison can update the UI, preventing stale results and unnecessary concurrent API requests.

Testing

• git diff --check ✅
• node --check public/github_profile_finder/script.js ✅
• Verified rapid profile searches and comparison flows are protected against stale results.
• Verified only the intended script.js file was modified.

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[github-actions]

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