feat: optional xblocks

[DanielVZ96]

Description

This PR implements separating optional progress from normal progress, and also displaying optional chapters and sequences in the outline.

Testing instructions

follow the instructions from this PR: openedx/edx-platform#34275

Private-ref: BB-8586

[openedx-webhooks]

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[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (open-release/palm.master@21698b4). Click here to learn what that means.

Files	Patch %	Lines
...ess-tab/course-completion/CompletionDonutChart.jsx	87.50%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##             open-release/palm.master    #1296   +/-   ##
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  Coverage                            ?   86.96%           
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  Files                               ?      253           
  Lines                               ?     4379           
  Branches                            ?     1113           
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  Hits                                ?     3808           
  Misses                              ?      552           
  Partials                            ?       19           

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[Agrendalath]

@DanielVZ96, same note as here.

[openedx-webhooks]

@DanielVZ96 Even though your pull request wasn’t merged, please take a moment to answer a two question survey so we can improve your experience in the future.