Enable RTC by default, redo.

[peterwilsoncc]

Enable Real Time Collaboration by default.

Trac ticket: https://core.trac.wordpress.org/ticket/64622

• Reverts option name change
• Adds filter so default value of the option is true.
• Re-applies test changes from original commit to account for reversal of default. (Note: I've removed the remove_filter() calls as they are reset between tests in the test suites default tearDown method.)

Use of AI Tools

None.

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Props peterwilsoncc, czarate, sergeybiryukov.

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[chriszarate]

Is this necessary / useful if we are separately filtering the default value?

[peterwilsoncc]

The practice has been to add the default options regardless, see link_manager_enabled which uses a similar filter:

Edit to remove dumb example: all the other options that default to a falsey value are included here even though they're not strictly required.

[peterwilsoncc]

@chriszarate Actually ready for review now... I'd missed that the filter in the tests preflighting the option to off needed to use __return_zero for it to actually work due to this code:

wordpress-develop/src/wp-includes/option.php

Lines 152 to 154 in a9fbc1b

	if ( false !== $pre ) {
	return $pre;
	}

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 61833
GitHub commit: 1f333db

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.