Fix loading RTL CSS files on all RTL sites

[farhadsakhaei]

There is a problem on all RTL sites using block themes and block CSS files
This fixes loading all RTL CSS files and also add suffix to the styles object

This fixes:
https://wordpress.org/support/topic/rtl-problem-bug/
WordPress/gutenberg#41649
WordPress/gutenberg#41762

CC to locale managers:
@naokomc
@tobifjellner

Trac ticket:

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

Hi @farhadsakhaei! 👋

Thank you for your contribution to WordPress! 💖

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Thank you,
The WordPress Project

[sabernhardt]

Thanks! I posted this to Trac 56325, without the tabs in the empty lines. If you want to remove those tabs here as well, then the PR should pass the PHP coding standards check.

Also, please share your WordPress.org username to receive props on the next release. One way is to add a comment on the Trac ticket.

[farhadsakhaei]

@sabernhardt
Thank you
I couldn't create a ticket on wp.org because I can't login to wp.org
This is my username: farhad0