Add the `dirty` column to the dolt_branches table #15295

Job	Run time
Go tests - no race (macos-latest)	2m 27s
Go tests - no race (ubuntu-22.04)	2m 14s
Go tests - no race (windows-latest)	5m 31s
Go tests (macos-latest)	11m 15s
Go tests (ubuntu-22.04)	36m 11s
Go tests (windows-latest)	23m 26s
	1h 21m 4s

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