chore: enable size limit on CI

[yordis]

Description

Enables size-limit on CI

Related Issue

REQUIRES https://github.com/plausible/plausible-tracker/pull/40 to be merged first

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.