feat: monorepo publishing W-20054928

[mshanemc]

• publish from a relative path (monorepo support)
  • has to do working-directory for publish-check too
• npm install => npm ci
• npm doesn't support a --timeout option like yarn does, so it has to go into npm config

proof it works

https://github.com/forcedotcom/salesforcedx-vscode/actions/runs/18913105203/job/53999344120 (dry run)
@salesforce/[email protected] (not dry run)

[had to temporarily point it at a branch, reverting that in the final commit]