Code Insights: Fix visual problems with creation UI capture group checks
Created by: vovakulikov
After merging visual check into main we got a few visual problems and misalignments in the check section of the capture group creation form.
This PR fixes
- Code block background, now it doesn't have any background
- Spacing for checks block, prior to this PR it had a too large a top margin
- Removes duplicate block about name and color
- Removes file filter from validation checks