Increase certificate key size for mesh-to-mesh communication #1938

Job	Run time
Check whether integration tests should run based on the changed files	4s
Check whether unit test & lint should run based on the changed files	4s
Check whether UI tests should run based on the changed files	3s
Check whether build image should run	3s
Check whether to run verify-commit-pins	4s
Dispatch verify-commit-pins	0s
Dispatch unit test / Lint	3m 1s
Dispatch unit test / Run unit tests	4m 6s
Dispatch unit test / Run unit tests with experimental build tag	3m 21s
Build manager image	5m 5s
Dispatch UI tests	0s
Dispatch integration tests / Istio integration test	22m 52s
Dispatch integration tests / Istio upgrade integration test	4m 53s
Dispatch integration tests / Istio integration test evaluation	3m 38s
Dispatch integration tests / Kubernetes version compatibility test	23m 2s
	1h 10m 16s

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