unity build plugins

[unity]如果FunctionBridge.Gen.h没生成，拷贝一个（主要用于ci构建） #373

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Job	Run time
ios	14m 37s
linux64	4m 9s
android	6m 8s
ohos	6m 10s
osx	9m 33s
wasm	1m 11s
windows	7m 52s
	49m 40s