Menu bar items can't be removed by changing the config.menuBar.removeItems property in other plugins constructors

[Dumluregn]

📝 Provide detailed reproduction steps (if any)

1. Add the following line in any plugin constructor (e.g. FontSizeEditing):

editor.config.define( 'menuBar.removeItems', [ 'menuBar:bold' ] );

2. Open any demo using the menu bar and the removed item, e.g. all-features ( yarn manual -f ckeditor5/all-features )
3. Open menu Format=>Text.

✔️ Expected result

The "Bold" button is gone.

❌ Actual result

It's still visible.

❓ Possible solution

This happens because:

1. Menu bar stores the config clone in the corresponding EditorUI plugin.
2. This clone is created before the plugin initialization.
3. Even if some plugin wants to change the menu bar config, it can't access the clone.

So currently, the only way to remove a menu bar item is doing so directly within the config passed to the editor creator function.

📃 Other details

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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