fix: update resolveRevision to use the correct source for multi-source app (cherry-pick #18194) #29013

Job	Run time
changes	12s
Build & cache Go code	3m 5s
Ensure Go modules synchronicity	35s
Check changes to generated code	8m 34s
Lint Go code	5m 4s
Build, test & lint UI code	0s
Run unit tests for Go packages	4m 12s
Run unit tests with -race for Go packages	7m 59s
Run end-to-end tests (v1.29.1)	44m 50s
Run end-to-end tests (v1.28.6)	46m 9s
Run end-to-end tests (v1.27.10)	46m 21s
Run end-to-end tests (v1.26.13)	46m 22s
Run end-to-end tests (v1.25.16)	46m 24s
Process & analyze test artifacts	0s
E2E Tests - Composite result	1s
	4h 19m 48s

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