Cannot use TrackChanges plugin while customizing comments features

[bendemboski]

📝 Provide detailed reproduction steps (if any)

Create a CKEditor build that uses the TrackChanges glue plugin, but instead of using the Comments glue plugin, uses CommentsEditing and CommentsUI.

✔️ Expected result

It works

❌ Actual result

Uncaught (in promise) CKEditorError: plugincollection-soft-required {"missingPlugin":"Comments","requiredBy":"TrackChanges"}
Read more: https://ckeditor.com/docs/ckeditor5/latest/support/error-codes.html#error-plugincollection-soft-required
    at checkMissingPlugin (plugincollection.js:262:23)
    at plugincollection.js:229:17
    at Array.forEach (<anonymous>)
    at validatePlugins (plugincollection.js:228:18)
    at plugincollection.js:215:21
    at Array.reduce (<anonymous>)
    at getPluginConstructors (plugincollection.js:209:18)
    at PluginCollection.init (plugincollection.js:154:40)
    at Editor.initPlugins (editor.js:456:29)
    at editor.ts:211:12

❓ Possible solution

If the TrackChanges plugin were to have a soft requirement on the individual plugins it actually cares about (does it actually depend on the CommentsOnly plugin or on the CommentsArchive plugin?) rather than the whole Comments glue plugin, then builds could use the TrackChanges plugin while also customizing the comments features/plugins.

📃 Other details

• First affected CKEditor version: CKEditor 44

Our use case is that we don't want the CommentsOnly or CommentsArchive plugins inflating our bundle or adding to runtime overhead, so we include CommentsEditing and CommentsUI instead. But we want all of the track changes functionality, so we want to use the TrackChanges plugin, but can't.

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