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Sandbox alpha and beta styles from stable

Description

Sandbox alpha and beta styles from stable

This moves all styles that get loaded in the head into
separate ResourceLoader modules.

I've left any .alpha, .beta class usage in JavaScript modules
and special pages since they do not matter so much.

Alpha styles are left in beta modules given that we have been talking
about removing alpha and performance is less of a concern in this mode

Other changes:

  • Remove FIXME relating to spinner which seems to be from the mw-ui-icon days

and is no longer needed.

Bug: T98400
Change-Id: I08eb91094f36e07b36e2351054c89f608d384c17