chore: re-enable bundle checker now master and branches both use pnpm

[pauldambra]

the bundle size checker autodetects the build tool but couldn't cope with yarn on master and pnpm on a branch

now that master is on pnpm we can turn it back on

[github-actions]

Size Change: 0 B

Total Size: 762 kB

ℹ️ View Unchanged

Filename	Size
dist/array.full.js	179 kB
dist/array.js	120 kB
dist/es.js	120 kB
dist/exception-autocapture.js	12 kB
dist/module.js	120 kB
dist/recorder-v2.js	104 kB
dist/recorder.js	58.4 kB
dist/surveys.js	48.7 kB

_{compressed-size-action}