[iOS] App Level Error Handing

[moiz994]

As we move to the new app, it has been seen that it does not have the extensive error handling that the current production app has. We need to run an in-depth analysis to test and verify places for improvement and implementation followed by actual implementation of the error handling for a smoother and better user experience.

Legacy Documentation | Confluence

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1. [iOS] Verify App Level Error Handling #369
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2. [iOS] Course Access Error Handling Improvements #442
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3. [iOS] Verify and Fix Course Level Empty Screens #454
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