Fixes registered templates access in get_block_templates()

[lgersman]

This ticket fixes using templates registered by register_block_template() in the Gutenberg editor.

Function get_block_templates() tries to accumulate registered block templates from the Block Template Registry

The problem is that the Block Template Registry call get_by_query( $query ) returns an associative array but the code expects a indexed array.

Trac ticket: https://core.trac.wordpress.org/ticket/62407

Could you have a look into it, @noisysocks ?

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[lgersman]

Hey @noisysocks,

I fixed the failing test test_get_block_templates_from_registry.

The documentation of the get_block_templates() function does not clearly express whether an index-based or associative array will be returned.
I assume that get_block_templates() should return either an index based OR an associative (key based) array.

Gutenberg assumes an index based array (see bug https://core.trac.wordpress.org/ticket/62407).
In any case, I found this more sensible than an array with mixed (!) indices as in the current implementation.

The bugfix and the corresponding test case have been adapted accordingly.

The one (gracefully) failing e2e check (https://github.com/WordPress/wordpress-develop/actions/runs/12610283240/job/35144694194) has nothing to do with the proposed check. I assume it's just an timeout.

Cheers,

Lars