Fix `JavaScriptEventLoop` for Embedded Swift in `main` toolchain snap… #2755

Job	Run time
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 20s
build-examples-deploy	59m 36s
prettier	11s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	20m 50s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 53s
format	34s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	14m 42s
Build for native target (macos-15, Xcode_26.0.1)	3m 8s
check-bridgejs-generated	3m 30s
build-examples	-7s
deploy-examples	19s
	1h 59m 56s

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