Add the `dirty` column to the dolt_branches table #15293

Job	Run time
Go tests - no race (macos-latest)	2m 1s
Go tests (macos-latest)	8m 15s
Go tests - no race (ubuntu-22.04)	2m 15s
Go tests (ubuntu-22.04)	8m 17s
Go tests - no race (windows-latest)	6m 12s
Go tests (windows-latest)	8m 10s
	35m 10s

Provide feedback