chore: Simplify & fix Swift 6 issues in protocol test manifest (#1855) #4142

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	11m 5s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	9m 42s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	8m 51s
apple (macos-14, Xcode_15.2, platform=macOS)	10m 35s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	7m 24s
linux (jammy, 5.9)	9m 33s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	6m 45s
linux (jammy, 6.0)	9m 23s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	7m 43s
apple (macos-15, Xcode_16.1, platform=macOS)	8m 46s
	1h 29m 47s

Provide feedback