[RFC] Switch C# completer to LSP #774

Job	Run time
C++ Lint	11m 18s
C++ Lint	11m 18s
Windows MSVC 17 x64 - C++ Benchmark	4m 23s
Windows MSVC 17 x64 - C++ Benchmark	4m 23s
ubuntu-24.04 - C++ Benchmark	2m 9s
ubuntu-24.04 - C++ Benchmark	2m 9s
Windows MSVC 17 x64 - test run	33m 20s
Windows MSVC 17 x64 - test run	33m 20s
ubuntu-24.04 - test run	26m 21s
ubuntu-24.04 - test run	26m 21s
Windows MSVC 17 x86 - test run	37m 42s
Windows MSVC 17 x86 - test run	6h 0m 8s
macos-14 - C++ Benchmark	1m 48s
macos-14 - C++ Benchmark	1m 48s
Windows MSVC 16 x64 - test run	36m 22s
Windows MSVC 16 x64 - test run	6h 0m 11s
macos-14 - test run	22m 43s
macos-14 - test run	22m 43s
ubuntu-24.04 - with Clang compiler - test run	26m 54s
ubuntu-24.04 - with Clang compiler - test run	26m 54s
ubuntu-24.04 - without libclang completer - test run	26m 49s
ubuntu-24.04 - without libclang completer - test run	26m 49s
	18h 25m 53s

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