session: avoid starting twice due to UI responsiveness #2195

Job	Run time
Setup configuration	2s
Build Sysroot (arm64, ios)	38m 43s
Build Sysroot (arm64, ios_simulator)	42m 10s
Build Sysroot (arm64, ios-tci)	52m 22s
Build Sysroot (arm64, macos)	41m 56s
Build Sysroot (arm64, visionos)	38m 45s
Build Sysroot (arm64, visionos_simulator)	42m 53s
Build Sysroot (arm64, visionos-tci)	54m 50s
Build Sysroot (x86_64, macos)	34m 19s
Build Sysroot (x86_64, ios_simulator)	42m 42s
Build Sysroot (x86_64, visionos_simulator)	30m 5s
Build Sysroot (Universal Mac)	1m 18s
Build UTM (arm64, ios)	6m 5s
Build UTM (arm64, ios_simulator)	6m 4s
Build UTM (arm64, ios-tci)	6m 4s
Build UTM (arm64, macos)	5m 42s
Build UTM (arm64, visionos)	1s
Build UTM (arm64, visionos_simulator)	1s
Build UTM (arm64, visionos-tci)	1s
Build UTM (x86_64, macos)	1s
Build UTM (x86_64, ios_simulator)	1s
Build UTM (x86_64, visionos_simulator)	1s
Build UTM (Universal Mac)	0s
Submit (macOS)	0s
Package (macOS)	0s
Package (iOS HV)	0s
Package (iOS-TCI IPA)	0s
Package (iOS IPA)	0s
Package (iOS DEB)	0s
	7h 24m 6s

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