Interactivity API: Apply the same directive name restrictions as the client

[sirreal]

Prevent the server from rendering directives that the client will ignore.

The server renders:

<div data-wp-class--bottom-[-24rem]="context.true">
<!-- as -->
<div class="bottom-[-24rem]" data-wp-class--bottom-[-24rem]="context.true">

The client does not support that behavior. It was never intended to be supported.

See WordPress/gutenberg#65803.

Trac ticket: https://core.trac.wordpress.org/ticket/62426

Todo:

• Add tests
• Add note to source in client to keep regexes in sync.

---

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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[github-actions]

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Props jonsurrell, joemcgill.

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[joemcgill]

This looks good to me.

[joemcgill]

This is really helpful, but can probably be improved since this URL is pinned to a specific hash. Not a blocker for commit though.

[github-actions]

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

SVN changeset: 60070
GitHub commit: 804ca75

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

[sirreal]

Thanks for reviewing and landing this!