chore: Don't fail prepare-release when build request is missing #4206

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	24m 30s
linux (jammy, 5.9)	9m 29s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	13m 50s
linux (jammy, 6.0)	9m 31s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	11m 53s
apple (macos-14, Xcode_15.2, platform=macOS)	14m 26s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	7m 49s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	6m 31s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	10m 25s
apple (macos-15, Xcode_16.1, platform=macOS)	10m 56s
	1h 59m 20s

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