[dashboard] add column count restriction per section support #8939
Description
Describe your motivation
Feels like sections should have their own column count restrictions, so that I could have 3 columns in section 1, 4 columns in section 2. I could potentially use different dashboards for this, but then I can't move the sections around.
Describe the solution you'd like
Consider using a grid for sections instead of subgrids (controlling column count).
Describe alternatives you've considered
No response
Additional context
No response