treewide: do not overwrite lsp-client-settings changed by user #5160

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 55s
test (ubuntu-latest, 28.2, false)	2m 24s
test (ubuntu-latest, 29.3, false)	2m 6s
test (macos-latest, 27.2, false)	3m 8s
test (macos-latest, 28.2, false)	4m 16s
test (macos-latest, 29.3, false)	3m 53s
test (windows-latest, 27.2, false)	2m 29s
test (windows-latest, 28.2, false)	2m 50s
test (windows-latest, 29.3, false)	2m 57s
test (ubuntu-latest, snapshot, true)	1m 20s
test (macos-latest, snapshot, true)	3m 13s
test (windows-latest, snapshot, true)	1m 0s
	31m 31s

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