Global Styles: Introduce a filter for toggling stylesheet cache

[tyxla]

Trac ticket: https://core.trac.wordpress.org/ticket/55780

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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]

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[oandregal]

👋 I wanted to cross-post that I commented at WordPress/gutenberg#41201 (comment) so it's not missed.

[oandregal]

Cross-posting here as well:

Miguel has prepared WordPress/gutenberg#45679 I think is very promising and should cover all cache invalidation we need. We only need to fix the automated tests.

[tyxla]

Closing in favor of WordPress/gutenberg#45679.