TS2Swift: Remove unused type definitions #1926

Job	Run time
build-examples	43m 55s
check-bridgejs-generated	2m 42s
format	34s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 5s
Build for native target (macos-15, Xcode_16.4)	1m 56s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 26s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 13s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 20s
deploy-examples	-1s
	1h 47m 10s

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