(experiment): distinguish singleheader json in toplevel jsonhpp BUILD #4668

Job	Run time
KytheXrefs	0s
KytheVerification	0s
x86_64 test	3m 43s
MacOsBuild	4m 13s
arm64 test	12m 41s
MacOsBuildDevTools	6m 10s
ClangTidy	3m 6s
x86_64 test-clang	3m 53s
PrepareVSPlugin	2m 16s
arm64 test-clang	13m 5s
RunBantBuildCleaner	3m 20s
x86_64 test-nortti	4m 8s
x86_64 test-c++20	4m 7s
VerifyFormatting	22s
x86_64 test-c++23	3m 50s
WindowsBuild	10m 26s
x86_64 smoke-test	15m 5s
arm64 smoke-test	11m 24s
x86_64 asan	5m 57s
x86_64 asan-clang	5m 35s
x86_64 compile	12m 24s
arm64 compile	7m 26s
x86_64 compile-clang	7m 49s
arm64 compile-clang	7m 46s
x86_64 compile-static	7m 48s
arm64 compile-static	7m 30s
x86_64 compile-static-clang	10m 27s
arm64 compile-static-clang	8m 1s
x86_64 coverage	19m 13s
x86_64 clean	7m 30s
arm64 clean	7m 12s
Build and deploy GitHub pages	11s
📦 Release	0s
	3h 36m 38s

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