Issue #3632995: Add missing service alias for MetatagRoutesHelperInterface.

Fons Vandammerequested to merge
issue/metatag-3632995:3632995-metatag-2.2.1-causes into 2.2.x

MetatagHooks is autowired and type-hints MetatagRoutesHelperInterface, but no service is registered under that interface, so the container fails to compile on 2.2.1. This adds the alias to metatag_routes.helper, matching how metatag.services.yml declares its aliases.

Tested on Drupal 11.4: error reproduces on 2.2.1, gone with this MR.

AI disclosure: I used an AI assistant (Claude) to investigate and write this fix. I reviewed and tested the change myself.

Closes #3632995

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