Improve entity rows layout

[timgl]

Changes

The previous close button was way too subtle and in the wrong place (it was under filters?). This is much clearer

Checklist

• All querysets/queries filter by Organization, by Team, and by User
• Django backend tests
• Jest frontend tests
• Cypress end-to-end tests

[paolodamico]

Found an edge case, let me fix this first.

[paolodamico]

Well this took a bit longer than expected, stubborn divs... & a hacky CSS solution, but see below,

We should make a note that the experience isn't great for certain screen widths (see example below) where the screen is small but not too small to trigger the mobile breakpoint. From a user standpoint it'd be great to have a different multi-line layout, but we need to be deliberate about the design so each group set is clear.