Remove slack_reporter from prow config

[keisku]

Fixed #21794

[k8s-ci-robot]

Hi @kskumgk63. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[alvaroaleman]

/lgtm cancel
The genererated config reference needs updating:

UPDATE=true go test ./prow/config/... -run TestGenYamlDocs

[keisku]

/test pull-test-infra-bazel

[k8s-ci-robot]

@kskumgk63: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test pull-test-infra-bazel

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[alvaroaleman]

/ok-to-test

[keisku]

/test pull-test-infra-bazel

[alvaroaleman]

/label tide/merge-method-squash

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, kskumgk63

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