Revert "Revert "`gangway`: add status change endpoint""

[Prucek]

Original PR: https://github.com/kubernetes-sigs/prow/pull/116 Reverts kubernetes-sigs/prow#156 Resolves: kubernetes-sigs/prow#155

The problem was in the WaitForJobExecutionStatus() method, it was only waiting for the execution to exist and not for the actual status to appear, and then of course, sometimes it was pending and sometimes triggered, and that caused the flakiness. A simple true->false solved it.

[k8s-ci-robot]

Hi @Prucek. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[danilo-gemoli]

/ok-to-test

[Prucek]

/test pull-prow-integration

[Prucek]

/hold

[Prucek]

/test pull-prow-integration /unhold

[petr-muller]

Can you drop a sentence or two into the description about what the problem was and what is the fix?

[smg247]

/test pull-prow-integration

let's try it once more ;)

[petr-muller]

/test integration /approve

@smg247 seeing you already reviewed the code I'm leaving the lgtm up to you ;)

[k8s-ci-robot]

@petr-muller: The specified target(s) for /test were not found. The following commands are available to trigger required jobs:

• /test pull-prow-image-build-test
• /test pull-prow-integration
• /test pull-prow-unit-test
• /test pull-prow-verify-lint

The following commands are available to trigger optional jobs:

• /test pull-prow-unit-test-race-detector-nonblocking

Use /test all to run all jobs.

In response to [this](https://github.com/kubernetes-sigs/prow/pull/159#issuecomment-2141940778): >/test integration >/approve > >@smg247 seeing you already reviewed the code I'm leaving the lgtm up to you ;) Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: petr-muller, Prucek

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/prow/blob/main/OWNERS)~~ [petr-muller] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[petr-muller]

/test pull-prow-integration

[smg247]

/lgtm