refactor: deprecate data-plane-public-api-v2 and proxy feature (#4823) #1330

Job	Run time
Publish-Dependencies / publish-dependencies	3m 16s
Publish-Snapshot / Check for required credentials	1s
Publish-Snapshot / Publish artefacts to OSSRH Snapshots	43m 26s
Publish-Dependencies / Post-To-Discord	0s
	46m 43s

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