docs: Update signed-release-assets.md (#16755) #15

Job	Run time
Build, test & lint UI code	2m 9s
Build & cache Go code	2m 51s
Ensure Go modules synchronicity	37s
Check changes to generated code	8m 51s
Lint Go code	4m 26s
Run unit tests with -race for Go packages	7m 42s
Run unit tests for Go packages	3m 53s
Run end-to-end tests (v1.28.2)	51m 24s
Run end-to-end tests (v1.27.6)	43m 35s
Run end-to-end tests (v1.26.9)	43m 54s
Run end-to-end tests (v1.25.14)	48m 32s
Process & analyze test artifacts	19s
	3h 38m 13s

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