feat: restricted unnecessary api calls

[sundasnoreen12]

INF-1295

Description

Need following Improvements for the "Content Unavailable" Screen in the Discussion MFE and In-Context Sidebar.

A.C

1. Optimized API calls by restricted unnecessary parallel requests, only invoking the API returning the isEnroll attribute when needed, and prevented additional calls.
2. Ensured that unavailable content within the in-context sidebar remains hidden across all use cases.

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.83%. Comparing base (4914f51) to head (ccd3b96).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #683   +/-   ##
=======================================
  Coverage   92.82%   92.83%           
=======================================
  Files         158      158           
  Lines        3304     3307    +3     
  Branches      896      899    +3     
=======================================
+ Hits         3067     3070    +3     
  Misses        218      218           
  Partials       19       19           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.