Update to use specific swc version for PR stats (#40237)
Currently we use one dev swc build for running release/PR stats although the latest swc build could be incompatible with previous tags/commits being compared against so this updates to use the specific version related to that tag. This also updates to omit the swc size from `node_modules` size since it's a dev build and not helpful to track.
Fixes: https://github.com/vercel/next.js/runs/8189857273?check_suite_focus=true
