Token refresh request is being sent after editor is destroyed

[lkszzajac]

📝 Provide detailed reproduction steps (if any)

1. Create an editor that sends a request for an auth token to Cloud Services
2. (optional) In the user-defined token endpoint, modify the lifespan of the token to some low value, like 20s
3. While using the editor with a valid token, close the endpoint token service to fail the token refresh request.
4. Immediately after the first failure, destroy the editor using editor.destroy()

✔️ Expected result

Editor is destroyed, no token requests are being made

❌ Actual result

• token refresh requests are being made every 5s
• this seems to happen at random
• opening other secondary editors (Revision History, Comment/Suggestion input etc) may influence the behavior

📃 Other details

• Browser: n/a
• OS: n/a
• First affected CKEditor version: n/a
• Installed CKEditor plugins: n/a

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