ci: revert "use require-label action for health-check"

[youtalk]

Reverts #5771

The health-check workflow triggered by the schedule and workflow_dispatch events is now always failing.
https://github.com/autowarefoundation/autoware/actions/runs/13675622013

I tried some correction methods, but it still isn’t working well. So I revert it for now and submit a fix PR later.

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[youtalk]

@mitsudome-r @xmfcx To merge this, we need to remove the require-label from the required check.

[xmfcx]

We were only using these for workflows triggered by the PR events and on differential workflows. So it's expected this should fail on schedule and workflow_dispatch triggers. I'll remove the requirement and merge it 👍

[xmfcx]

We should add the correct checking mechanism so the require-label only activates for the pull request targets.