feat(dap-ui): Make overlay's priority customizable #527

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 12s
test (ubuntu-latest, 28.2, false)	1m 22s
test (ubuntu-latest, 29.1, false)	1m 25s
test (macos-latest, 27.2, false)	2m 52s
test (macos-latest, 28.2, false)	3m 49s
test (macos-latest, 29.1, false)	2m 53s
test (windows-latest, 27.2, false)	1m 35s
test (windows-latest, 28.2, false)	2m 1s
test (windows-latest, 29.1, false)	1m 39s
test (ubuntu-latest, snapshot, true)	1m 10s
test (macos-latest, snapshot, true)	2m 29s
test (windows-latest, snapshot, true)	1m 14s
	23m 41s

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