fix: resolve issue when enum that has functions is used in entity

[dariosn85]

Fixes: #7651

Description of change

In case if we are working with enums that contains functions (declaration merging, described in details in issue ticket) corrupted SQLs are generated for migration which leads into failure on the DB side. This fix addresses that issue by filtering out such functions from metadata.

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run lint passes with this change
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• [N/A] Documentation has been updated to reflect this change
• The new commits follow conventions explained in CONTRIBUTING.md

[AlexMesser]

thank you for contribution!