SF-3332 Prevent user from deleting footnotes

[RaymondLuong3]

Users were previously allowed to make a selection that included a cross reference or footnote. We do not want to allow users to select these notes which they would then be able to overwrite or delete. This PR introduces logic to identify notes contained in a collection and update the selection be come before the notes.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.03%. Comparing base (dfb04af) to head (d2463c8).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...re/ClientApp/src/app/shared/text/text.component.ts	88.88%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3915      +/-   ##
==========================================
- Coverage   81.04%   81.03%   -0.02%     
==========================================
  Files         645      645              
  Lines       41434    41450      +16     
  Branches     6748     6730      -18     
==========================================
+ Hits        33581    33589       +8     
- Misses       6747     6764      +17     
+ Partials     1106     1097       -9     

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[marksvc]

This is reviewable in Devin Review.

[marksvc]

@marksvc reviewed all commit messages and made 1 comment.
Reviewable status: 0 of 2 files reviewed, 1 unresolved discussion (waiting on RaymondLuong3).

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src/SIL.XForge.Scripture/ClientApp/src/app/shared/text/text.component.ts line 1955 at r1 (raw file):

        textualNoteIndex += op.insert.length;
      } else if (op.insert != null && typeof op.insert === 'object') {
        if (op.insert['note'] != null) break;

I would expect that other embeds can likewise be deleted, not just footnotes. Do we have reason to believe that it's only notes that are affected by the bug?