chore: remove dev files in dist version

[paulbalandan]

Description Removes unnecessary development files from the version pulled by composer when preferred-install: dist.

Checklist:

• [x] Securely signed commits
• [ ] Component(s) with PHPDoc blocks, only if necessary or adds value
• [ ] Unit testing, with >80% coverage
• [ ] User guide updated
• [ ] Conforms to style guide