fix: issues with custom enum name in Postgres

[AlexMesser]

Description of change

Fixes #7614
Fixes #7647

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
• Documentation has been updated to reflect this change
• The new commits follow conventions explained in CONTRIBUTING.md

[eranganovade]

@AlexMesser Hello, Thank you for fixing this issue. Do you have an idea on when would be the next typeorm release? We would really like to use the latest changes you guys have done so far. 🎉

[AlexMesser]

@eranganovade we plan to release a new version at the end of this month

[PetrBrabec]

Hello, thank you for fixing this issue! Are you still planning the new release with this fix for today?

[AlexMesser]

@PetrBrabec 0.2.33 was released 🎉