fix(ci): dispatch the resolver by filename, not display name (#33039)

Every backport from here fails at the handover. `plan` passes — the label
is authorised and the release branches resolve — then both dispatch jobs
fail, because they name a workflow that no longer exists:
openmetadata-collate renamed `Resolve an OpenMetadata backport conflict`
to `Backport a labeled OpenMetadata PR` when it took over driving the
whole backport rather than only conflicts.

A dispatch by display name is a cross-repository reference with nothing
checking it: no linter sees it, and it breaks silently on a rename in
another repo. `benc-uk/workflow-dispatch` also accepts a filename, which
does not move when the workflow is renamed, so use that instead.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: mohityadav766

.github/workflows/backport-labeled-prs.yaml

@@ -172,7 +172,11 @@ jobs:
         id: dispatch
         uses: benc-uk/workflow-dispatch@v1.3.2
         with:
-          workflow: Resolve an OpenMetadata backport conflict
+          # By filename, not display name. This was `Resolve an OpenMetadata
+          # backport conflict` and broke the moment that workflow was renamed —
+          # a dispatch by display name is a cross-repo reference with nothing
+          # checking it. The filename is stable across renames.
+          workflow: oss-backport-resolve.yaml
           repo: open-metadata/openmetadata-collate
           ref: main
           token: ${{ secrets.COLLATE_PAT }}