install nlohmann/json_fwd.hpp if using WITH_INTERNAL_NLOHMANN_JSON (f… #31644

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	52m 9s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	29m 10s
Run tests (5, ALL_BUT_PROVIDERS)	4m 40s
clang-tidy	1s
Run tests (5, POSTGRES)	3m 44s
Run tests (5, HANA)	4m 28s
Run tests (6, ALL_BUT_PROVIDERS)	31m 31s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	3m 15s
	2h 8m 58s

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