PHP load: move rest template controller 6.6 import to "REST" area :)

[ramonjd]

What?

WP_REST_Templates_Controller extends WP_REST_Controller so it's probably best if it's loaded with the rest of the REST controllers.

Testing Instructions

There are no functional changes here.

CI should pass and also templates should work/appear as you'd expected in the site editor.

Check PHP logs just in case.

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[andrewserong]

From looking at the linked files added in #60317, it doesn't seem that the load order was a factor there, so this looks like a safe change to me! I see you've added @fabiankaegy as a reviewer, so and it'll be a very quick revert if there was a reason the original order was used.

Just left a tiny whitespace nit, but otherwise LGTM! 🚀

[ramonjd]

From looking at the linked files added in #60317, it doesn't seem that the load order was a factor there, so this looks like a safe change to me! I

Thanks for checking @andrewserong

The endpoints are initialized in the rest_api_init hooks anyhow so it should be fine. Also this PR makes it all consistent with existing REST API extensions by moving it to the extra parent class check block.