Add the `dirty` column to the dolt_branches table #15299

Job	Run time
Go tests - no race (macos-latest)	2m 24s
Go tests (macos-latest)	11m 53s
Go tests - no race (ubuntu-22.04)	2m 20s
Go tests (ubuntu-22.04)	35m 38s
Go tests - no race (windows-latest)	5m 13s
Go tests (windows-latest)	23m 8s
	1h 20m 36s

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