[browser][coreCLR] provide PRODUCT_VERSION_JS & CI_BUILD_JS

[pavelsavara]

Pass real values from MSBuild

runtime/src/native/libs/System.Native.Browser/CMakeLists.txt

Lines 45 to 52 in 50c03e2

	if(NOT PRODUCT_VERSION_JS)
	# WASM-TODO get dotnet ProductVersion from MSBuild
	set(PRODUCT_VERSION_JS "10.0.0-dev")
	endif()
	if(NOT CI_BUILD_JS)
	# WASM-TODO get ContinuousIntegrationBuild from MSBuild
	set(CI_BUILD_JS "false")
	endif()

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