Delete Release Branch Sync workflow

[stuggi]

Starting with FR5 we no long rely on the specific release sync branch. Lets remove the job.

Jira: OSPRH-25747

[fmount]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fmount, stuggi

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[openshift-ci]

@stuggi: 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/functional	8c4e743	link	unknown	/test functional

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