Fix ConcurrentModificationException in UpgradeAnswerControls

[lukstbit]

Purpose / Description

Add a new copy list to be modified in the problematic forEach loop in UpgradeAnswerControls.

Fixes

• Fixes alpha6 crash on open #20340

How Has This Been Tested?

Ran tests, verified the reproduction behavior:

Checkout and run a commit before UpgradeAnswerControls was introduced -> Add a new Question & answer key -> Checkout and run the latest code

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[BrayanDSO]

gonna release a new alpha to test this

[mikehardy]

Concurrent Modification is a classic, and keeping an original list copy is a classic solution

I'm on the late show reviewing but this looks good - thanks @lukstbit and @BrayanDSO - and I see the new alpha7 just was marked as accepted + available in the store so even the affected alpha users prior to me halting rollout should now get this fix and have the app startup correctly

Cheers