feat: make nlohmann a required dependency (#15825) #8941

Job	Run time
debug_job	4s
Save PR ref	2s
Windows-Bazel / bazel + msvc-2022 + opt + Core	2m 31s
Windows-CMake	0s
macOS-CMake	0s
macOS-Bazel	0s
Notify-Google-Chat	4s
	2m 41s

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