chore: add visionOS to build and unit test jobs #399

Job	Run time
Build Amplify Swift for iOS / Build Amplify-Build \| iOS	9m 46s
Build Amplify Swift for iOS / Build Amplify-Build \| iOS	9m 46s
Build Amplify Swift for macOS / Build Amplify-Build \| macOS	9m 19s
Build Amplify Swift for macOS / Build Amplify-Build \| macOS	9m 19s
Build Amplify Swift for visionOS / Build Amplify-Build \| visionOS	1m 10s
Build Amplify Swift for visionOS / Build Amplify-Build \| visionOS	1m 9s
Build Amplify Swift for tvOS / Build Amplify-Build \| tvOS	7m 35s
Build Amplify Swift for tvOS / Build Amplify-Build \| tvOS	7m 35s
Build Amplify Swift for watchOS / Build Amplify-Build \| watchOS	10m 1s
Build Amplify Swift for watchOS / Build Amplify-Build \| watchOS	10m 1s
Confirm Passing Build Steps	1s
Confirm Passing Build Steps	1s
	1h 15m 43s

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