[COMP-LABELS] Cleanup and fix composable-labels model changeset

[lampajr]

Changes proposed

• Remove unnecessary public schema
• Remove ALTER OWNER instructions
• Add GRANT ALL to the created sequences
• Gave a bit more meaningful names to foreign keys

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.

[lampajr]

This is still not enough.. there are still some missing permission somewhere

[lampajr]

This is still not enough.. there are still some missing permission somewhere

Ok now the permissions should be properly set.

Tests are working and the changset execution works with a prod backup as well.