[core] Fix PR detection mechanism for upstream PRs (#28171)
[core] Fix PR detection mechanism for upstream PRs (#28171)


oliviertassinari/material-ui,oliviertassinari/material-ui,mui-org/material-ui,rscnt/material-ui,mui-org/material-ui,rscnt/material-ui,oliviertassinari/material-ui,rscnt/material-ui,mui-org/material-ui