Fix block comment to display correct time.

[USERSATOSHI]

What?

Closes #71650

This PR fixes the displayed comment time in collaboration to show the correct time based on WordPress Installation.

Why?

Earlier, the display time had its timezone offset applied twice ie If WordPress installation is set to UTC and device is set to IST instead of showing the time in UTC, the displayed time was UTC - 530.

How?

This PR addresses this by using getDate function to correctly get the date Object before applying dateI18n at packages/editor/src/components/collab-sidebar/comment-author-info.js#L57-L62

Testing Instructions

1. Set your computer to AEST (or another positive time zone)
2. Set your WordPress install to UTC
3. Edit a post
4. Start writing a comment on a block, observe the time stamp (it will be the correct UTC time)
5. Submit the comment, observe the time stamp ( it will be the correct UTC time now )

Screenshots or screencast

Before	After

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Co-authored-by: USERSATOSHI <tusharbharti@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: peterwilsoncc <peterwilsoncc@git.wordpress.org>

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[t-hamano]

LGTM! This PR works well, and I believe this is the best approach to solve the problem.