Interactivity API: Refactor to use string instead of an object

[cbravobernal]

Trac ticket: https://core.trac.wordpress.org/ticket/60542

Gutenberg backport: WordPress/gutenberg#59030

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Props cbravobernal, gziolo.

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[github-actions]

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[gziolo]

What was the original ticket where the same functionality landed? It would be better to link it instead when refactoring code unless it's a bug. Still, we would need the original commit and ticket to reference in the commit message.

[cbravobernal]

The code that implements that change is part of the interactivity package, that landed in 17.7

• Interactivity API: Support setting a namespace using a string in data-wp-interactive gutenberg#58743

Was implemented here:

• Editor: Update the WordPress packages to Gutenberg 17.7 RC1 #6077

And commited in this ticket:

• 60315

Edit:
The ticket that included the PHP supporting both the object and the string, and the router.
https://core.trac.wordpress.org/ticket/60356

[swissspidy]

Merged in https://core.trac.wordpress.org/changeset/57646