After plugin-e2e.yaml fix merges to main (PR privilegedescalation/.github#146),
update this repo to use the fixed main workflow instead of the temporary
hugh/add-pnpm-support-plugin-e2e feature branch.
The reusable plugin-e2e.yaml@main lacks pnpm support. Switching to
the PR branch that has pnpm detector, Corepack setup, and pnpm commands.
Will revert to @main once PR #141 merges.
- PRI-619 E2E fix
Co-Authored-By: Paperclip <noreply@paperclip.ing>