Simplify json rpc header parsing: remove lenient mode. #4027

Job	Run time
KytheVerification	9m 25s
ClangTidy	1h 25m 38s
MacOsBuildDevTools	7m 45s
MacOsBuild	4m 24s
Generate Build matrix	4s
PrepareVSPlugin	2m 11s
VerifyFormatting	2m 21s
x86_64 test	3m 46s
arm64 test	4m 39s
x86_64 test-nortti	4m 5s
x86_64 test-c++20	3m 44s
x86_64 test-c++23	16m 19s
x86_64 smoke-test	10m 3s
arm64 smoke-test	10m 51s
x86_64 smoke-test-analyzer	14m 28s
arm64 smoke-test-analyzer	15m 17s
x86_64 asan	6m 21s
x86_64 asan-clang	5m 5s
x86_64 compile	3m 26s
arm64 compile	3m 49s
x86_64 compile-clang	3m 26s
arm64 compile-clang	3m 46s
x86_64 compile-static	3m 16s
arm64 compile-static	3m 58s
x86_64 compile-static-clang	2m 58s
arm64 compile-static-clang	3m 41s
x86_64 coverage	16m 49s
x86_64 clean	6m 57s
arm64 clean	6m 43s
WindowsBuild	10m 41s
KytheXrefs	0s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	9s
📦 Release	0s
	4h 36m 5s

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