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coll: drop reference counter

Collations are reusable and the set of used collations is normally
stable and quite limited. Besides, there's no official way for the user
to drop collations and in the scope of #12376 we're going to hard-code
the list of available collations anyway. That said, let's drop the
collation reference counter and never delete created collations. This
greatly simplifies implementation of #12378 because then we don't need
to care about MT-accesses when we create or destroy a key definition
object referencing a collation.

Needed for #12378
Part of #12376

NO_DOC=internal
NO_TEST=not needed
NO_CHANGELOG=internal

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