Fix commit validation workflow

[cevich]

What type of PR is this?

/kind other

What this PR does / why we need it:

Fix commit title-length checking workflow bug

How to verify it

The workflow will fail on this PR when the very long 'DO NOT MERGE:...' commit is included. But the workflow will pass when that commit is removed.

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[cevich]

Ref: Workflow log with the too-long "DO NOT MERGE: ..." commit 26a4c1c.

[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[cevich]

Ref: Workflow log without the too-long "DO NOT MERGE: ..."

[TomSweeneyRedHat]

@cevich I like the idea, but the tests don't as of yet.