Restrict @JSClass to structs (#523) #1968

Job	Run time
Build for native target (macos-15, Xcode_16.4)	3m 12s
build-examples	42m 57s
check-bridgejs-generated	2m 47s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 0s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 31s
format	31s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 37s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 35s
deploy-examples	9s
	1h 46m 19s

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