DRA structured parameters: updates, promotion to GA

Some of the existing content was a bit stale, for example the
v1beta2 API changes were missing. Seamless upgrades were already
added in 1.33.

New for 1.34 are the dra_resource_claims_in_use metrics and
the Filter timeout. They are part of filling gaps identified for
GA. With those gaps closed, the criteria for GA should be satisfied,
so promotion to GA gets proposed for 1.34.

Author: pohly

keps/prod-readiness/sig-node/4381.yaml

@@ -6,3 +6,5 @@ alpha:
   approver: "@johnbelamaric"
 beta:
   approver: "@johnbelamaric"
+stable:
+  approver: "@johnbelamaric"