Sort diagnostics according to severity for detailed diag responses #628

Job	Run time
C++ Lint	6m 7s
ubuntu-20.04 - C++ Benchmark	2m 9s
Windows MSVC 17 x64 - C++ Benchmark	3m 47s
ubuntu-20.04 - test run	53s
Windows MSVC 17 x64 - test run	1m 48s
macos-12 - C++ Benchmark	3m 48s
Windows MSVC 17 x86 - test run	2m 23s
macos-12 - test run	1m 46s
Windows MSVC 16 x64 - test run	2m 7s
ubuntu-20.04 - with Clang compiler - test run	1m 9s
ubuntu-20.04 - without libclang completer - test run	58s
	26m 55s

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