feat: Support nested objects in merge generator using go templates (Issue #12836) #37836

Job	Run time
changes	13s
Lint Go code	3m 55s
Check changes to generated code	5m 6s
Build, test & lint UI code	1m 37s
Build & cache Go code	3m 8s
Ensure Go modules synchronicity	20s
Run unit tests for Go packages	5m 44s
Run unit tests with -race for Go packages	9m 23s
Run end-to-end tests (v1.31.0, true)	31m 40s
Run end-to-end tests (v1.30.4, false)	33m 52s
Run end-to-end tests (v1.29.8, false)	31m 9s
Run end-to-end tests (v1.28.13, false)	32m 26s
E2E Tests - Composite result	1s
Process & analyze test artifacts	33s
	2h 39m 7s

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