start to seperate lint and unit test

[BenTheElder]

bazel test //... will still run all bazel tests, however now you can run bazel test //... --config=unit to ignore our not-quite-hermetic lint tests, and bazel test //... --config=lint to only do lint.

This will let us split these pull-test-infra-bazel job into one job with build+unit tests and another that only does lints. The former should be a 100% cacheable presubmit and I expect this job to take ~one minute after this change. We'll have another job to install python deps and perform linting in ~2 minutes.

xref: #6865 #6808

[BenTheElder]

... which should drive down our overall presubmit time to ~2 minutes once we make the switch. I'm defering that until after we've validated these new job configs.

[BenTheElder]

/assign @ixdy @krzyzacy

[BenTheElder]

/area jobs
/area bazel

[krzyzacy]

/lgtm

[k8s-ci-robot]

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[k8s-ci-robot]

@BenTheElder: Updated the config configmap

In response to this:

bazel test //... will still run all bazel tests, however now you can run bazel test //... --config=unit to ignore our not-quite-hermetic lint tests, and bazel test //... --config=lint to only do lint.

This will let us split these pull-test-infra-bazel job into one job with build+unit tests and another that only does lints. The former should be a 100% cacheable presubmit and I expect this job to take ~one minute after this change. We'll have another job to install python deps and perform linting in ~2 minutes.

xref: #6865 #6808

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