feat(webhook): make app refresh operation concurrent (#14269) #22658

Job	Run time
Ensure Go modules synchronicity	25s
Build, test & lint UI code	2m 12s
Build & cache Go code	5m 27s
Check changes to generated code	11m 0s
Lint Go code	1m 54s
Run end-to-end tests (v1.27.2)	18m 17s
Run end-to-end tests (v1.26.0)	18m 18s
Run end-to-end tests (v1.25.4)	18m 24s
Run end-to-end tests (v1.24.3)	17m 59s
Run unit tests for Go packages	8m 21s
Run unit tests with -race for Go packages	15m 17s
Process & analyze test artifacts	29s
	1h 58m 3s

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