feat(code-server): multi-backend + tunnel, reuse/startOnBoot, Vue lau… #407

Job	Run time
e2e	2m 13s
unit-test / test (windows-latest, 24)	4m 13s
unit-test / test (windows-latest, 22)	5m 24s
unit-test / test (ubuntu-latest, 24)	1m 44s
unit-test / lint	1m 38s
unit-test / test (ubuntu-latest, 22)	2m 8s
unit-test / test (ubuntu-latest, 26)	2m 4s
unit-test / test (windows-latest, 26)	4m 23s
	23m 47s

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