fix(ui): tooltip positioning issues

[AlessioGr]

Description

1. Removes these

2. Better performance when errors are shown, as the interaction observers are no longer running

3. (Biggest change): properly displays field error tooltips if the field has no label (label: false).

Previous:

(Field label was just inserted at the top BELOW the top line. Without a label, that would be the toolbar)

Now:

Field label is now inserted ABOVE the top line, not below.

In case there is a label, I had to wrap the field error in a relative-positioned div which does NOT contain the label. Otherwise, the error tooltip would be displayed above the label, which would be weird.

• I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• Chore (non-breaking change which does not add functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Change to the templates directory (does not affect core functionality)
• Change to the examples directory (does not affect core functionality)
• This change requires a documentation update

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• Existing test suite passes locally with my changes
• I have made corresponding changes to the documentation