releng: Migrate all build canary jobs to krel

[justaugustus]

Outside of a few transient cluster scheduling issues, the krel-based master canary build job on Kubernetes Community infrastructure has been running pretty reliably for a few days, so let's cut the rest of the release branches over!

• Fix incorrectly transposed testgrid annotations for build jobs

  Release branch build jobs were named as K8s infra ("canary") build jobs
  and vice versa. This fixes that.

  Took the opportunity to also properly name the 1.18 jobs by version,
  instead of generic suffix.

• build-canary jobs are releng-blocking, but release-informing

  Adds a fork annotation as well.

• Migrate all build canary jobs to krel (ref: ci-kubernetes-build-* jobs should build without requiring bootstrap.py scenarios release#1711)

• Drop EOL 1.17 release branch jobs (ref: Cleanup release-1.17 slack mergewarnings and milestone applier #20589)

/assign @hasheddan @cpanato @saschagrunert
cc: @kubernetes/release-engineering @kubernetes/ci-signal @spiffxp

[hasheddan]

/lgtm

Thanks @justaugustus!

[saschagrunert]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hasheddan, justaugustus, saschagrunert

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[k8s-ci-robot]

@justaugustus: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key kubernetes-builds.yaml using file config/jobs/kubernetes/sig-release/kubernetes-builds.yaml
• key 1.17.yaml using file ``
• key 1.18.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.18.yaml
• key 1.19.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.19.yaml
• key 1.20.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.20.yaml

In response to this:

Outside of a few transient cluster scheduling issues, the krel-based master canary build job on Kubernetes Community infrastructure has been running pretty reliably for a few days, so let's cut the rest of the release branches over!

• Fix incorrectly transposed testgrid annotations for build jobs

Release branch build jobs were named as K8s infra ("canary") build jobs
and vice versa. This fixes that.

Took the opportunity to also properly name the 1.18 jobs by version,
instead of generic suffix.

• build-canary jobs are releng-blocking, but release-informing

Adds a fork annotation as well.

• Migrate all build canary jobs to krel (ref: ci-kubernetes-build-* jobs should build without requiring bootstrap.py scenarios release#1711)

• Drop EOL 1.17 release branch jobs (ref: Cleanup release-1.17 slack mergewarnings and milestone applier #20589)

/assign @hasheddan @cpanato @saschagrunert
cc: @kubernetes/release-engineering @kubernetes/ci-signal @spiffxp

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