ci: Implement the stacked-pr ci optimizer myself #2847
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Graphite's ci-optimizer feature starts charging, so we implement it directly.
If the target branch of a pr is not main and release branch, label the target branch of that pr with
skip:ci
.We expect that this will allow us to skip ci for the middle prs in the stacked-pr, but not the top and bottom.
Checklist: (if applicable)