Remove local() from generated webfonts styles

[aristath]

What?

This PR removes the local() generated styles from the webfonts API.

Why?

Apparently, using local() in @font-face styles generated from the Webfonts API is causing some issues for users: #42190

[github-actions]

Flaky tests detected in 9b8c9b5.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/3910756777
📝 Reported issues:

• [Flaky Test] should insert media, convert to blocks, and undo in one step #36123 in specs/editor/blocks/classic.test.js

[Luehrsen]

Maybe relevant as well:

https://core.trac.wordpress.org/ticket/57430

[hellofromtonya]

@Luehrsen The Core Trac ticket will likely be closed if the Fonts API makes it into 6.2. Why? Because this enhancement will be part of the API when it gets backported. If it doesn't get backported, then decisions can be made about whether to change what's in Core now. I'll comment on that Trac ticket.

[hellofromtonya]

The Fonts API renaming merged today. That means this PR will need to be rebased and the changes applied to the new API. @aristath it might be easier to close this PR and reopen a new one.

[hellofromtonya]

Thinking about it. I'll open a new PR and apply your changes @aristath to it.

[hellofromtonya]

Closed in favor of #47254.