test(codspeed): Make codspeed concurrent on `canary` branch (#80928)
### What?
Apply same changes as https://github.com/swc-project/swc/pull/10711 to next.js/turbopack. We now run benchmark on `canary` branch in parallel.
### Why?
`codspeed` says `New benchmark` quite frequently, but it's not. This PR should fix it