show comment form if there is no comment on any block

[rishishah-multidots]

Part of - #66377

What? & What?

Focus the reply field when clicking on the toolbar button, it currently doesn’t do anything when the sidebar is already open.

How?

The sidebar will now show a comment form for any selected block that does not yet have comments. This encourages user interaction and feedback.

Testing Instructions

1. Enable experimental inline commenting option under Gutenberg -> Experiments.
2. Edit any post/page.
3. Open the sidebar and click on any block or add any new block to see comment form in the sidebar.

Screenshots or screencast

https://www.loom.com/share/c2c3032a3f8443629514a57ac9668487?sid=452256dd-f06c-450b-b465-e7d3a4ceed86

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