Provide a unified (lsp-interface INTERFACE ...) pcase form #5378

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 9s
test (ubuntu-latest, 28.2, false)	2m 29s
test (ubuntu-latest, 29.4, false)	2m 37s
test (macos-latest, 28.2, false)	3m 41s
test (macos-latest, 29.4, false)	3m 36s
test (windows-latest, 27.2, false)	3m 18s
test (windows-latest, 28.2, false)	3m 4s
test (windows-latest, 29.4, false)	4m 14s
test (ubuntu-latest, snapshot, true)	1m 26s
test (macos-latest, snapshot, true)	3m 1s
test (windows-latest, snapshot, true)	5m 26s
	35m 1s

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