Changes:
- Make `GetActionWorkflow` only convert the target workflow
- In `getActionWorkflowEntry`, use `branchName` instead of resolving the
default branch name from `commit.GetBranchName()`
- Add `ref` to `workflow_run` notify input to avoid the empty `ref`
warning
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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>