feat: captcha only for learners

[sundasnoreen12]

INF-2043

Description

To prevent inconvenience for instructors, we should skip displaying the CAPTCHA for users who hold at least one course role (i.e., they are not just learners).

This PR includes the frontend changes required to support this behavior.

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 ✅

Please upload report for BASE (master@fa77205). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #792   +/-   ##
=========================================
  Coverage          ?   93.76%           
=========================================
  Files             ?      166           
  Lines             ?     3622           
  Branches          ?      969           
=========================================
  Hits              ?     3396           
  Misses            ?      210           
  Partials          ?       16           

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