Improve experience for managing migrations

[ajcvickers]

This is a grouping of related issues. Feel free to vote (👍) for this issue to indicate that this is an area that you think we should spend time on, but consider also voting for individual issues for things you consider especially important.

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Done in 9.0

• [x] #27322

Backlog

• [ ] #7152
• [ ] #32835
• [ ] #2167
• [ ] #36066
• [ ] #2174
• [ ] #18557
• [ ] #16406
• [ ] #15174
• [ ] #20682
• [ ] #22878
• [ ] #29068
• [ ] #17740
• [ ] #19694
• [ ] #21106
• [ ] #21443
• [ ] #21615
• [ ] #37342
• [ ] #22105

[jerriep]

I am very happy to see some improvements around migrations, especially the squashing of migrations. Thank you for looking into that one!