Currently if a PR that is elegible for backporting touches a workflow
file then the automatic backport fails.
Now adding the label `force-auto-backport-workflow` to a PR that touches
workflow files will proceed with the automatic backporting. This is
useful because sometimes we need to fix a workflow and backport it to
the current release branch or when we're adding support to a new
Postgres major version that requires workflow changes and it should be
backported to the release branch in case of creating patch releases.
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