BridgeJS: Remove call to `getImports` when no JS interface is imported #1881

Job	Run time
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	5m 34s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	5m 47s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	5m 32s
build-examples	11m 52s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	5m 18s
Build for native target (macos-15, Xcode_16.4)	1m 0s
format	31s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6m 48s
check-bridgejs-generated	5m 58s
deploy-examples	-1s
	48m 19s

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