feat(multivariate): report variant key on identities flag responses #17315

Job	Run time
Check actor permissions	27s
Add Conventional Commit labels	27s
Prepare Docker report comment	0s
Build Private Cloud Image	0s
Build Frontend Image	0s
Build API Enterprise Test Image	0s
Build API Test Image	0s
Build E2E Image	0s
Build API Image	0s
Build Unified Image	0s
run-e2e-tests-private-cloud	0s
run-e2e-tests	-1s
	53s

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