sync workflow: send PR instead of pushing to main

[chmeliik]

By pushing directly to main, build-definitions syncs would bypass CI
checks.

Not to mention the main branch is protected, so this workflow can't
push directly to main.

[chmeliik]

Still testing the changes. At the very least, I need someone who has the permissions to go to https://github.com/redhat-appstudio/tssc-sample-pipelines/settings/actions and enable Allow GitHub Actions to create and approve pull requests

[chmeliik]

Ok, tested in chmeliik#1, should work 🤞

The reason why it was failing here is that I opened the PR from my fork, so GitHub wouldn't give the automatically injected GITHUB_TOKEN write permissions for branches and pull requests. Once merged, the workflow will run from this PR so the token should receive the permissions the workflow requests.

But it's importing things we don't want, because the RHTAP pipeline in build-definitions picked up unwanted changes (again). Fixing in konflux-ci/build-definitions#1196

[chmeliik]

/retest

[chmeliik]

Ready for review

[openshift-ci]

@chmeliik: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/rhtap-sample-pipelines-yamllint	98bcf7e	link	false	/test rhtap-sample-pipelines-yamllint

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[chmeliik]

yamllint issues are unrelated to this PR

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chmeliik, mmorhun

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