fix(sync): make warnings private #10

Job	Run time
Standalone Package Export Check	32s
Valgrind Checks	29s
Static Analysis	25s
Runtime Smoke Checks	31s
Sanitized Build and Tests (clang, utils=OFF, net=OFF, json=OFF)	39s
Configuration Coverage	30s
Sanitized Build and Tests (gcc, utils=OFF, net=OFF, json=OFF)	28s
Sync Strict CI Summary	0s
	3m 34s

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