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]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
4859	1	4858	3

View the top 1 failed test(s) by shortest run time

.EditorComponent Translation Suggestions enabled::EditorComponent Translation Suggestions enabled select non-blank segment

Stack Traces | 0.197s run time

Error: Expected true to be false.
    at <Jasmine>
    at UserContext.<anonymous> (.../translate/editor/editor.component.spec.ts:457:45)
    at UserContext.fakeAsyncFn (node_modules/zone.js/fesm2015/zone-testing.js:1715:26)
    at _ZoneDelegate.invoke (node_modules/zone.js/fesm2015/zone.js:398:28)

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