[NT-400] Pledge View attributedString crash fix

[ifbarrera]

📲 What

Fixes a crash on PledgeViewController when the devices is rotated or the dynamic type size is changed.

🤔 Why

Because crashes are bad.

🛠 How

This crash was due to some strange async-like behavior when parsing an html string using:

NSMutableAttributedString(
    data: Data(string.utf8),
    options: [
      .documentType: NSAttributedString.DocumentType.html,
      .characterEncoding: String.Encoding.utf8.rawValue
    ],
    documentAttributes: nil
  )

We're not super sure what's actually the root cause of this issue, since during debugging we were able to see that this call was happening on the main thread. What we observed was that parsing an html string would actually cause a subsequent call to traitCollectionDidChange to occur in what would appear to be an infinite loop. Debouncing the trigger to the attributedConfirmationString function seems to solve the issue, although it seems to possibly be related to a deeper issue with constructing an attributed string with html options.

👀 See

Pledge View	Update Pledge View

✅ Acceptance criteria

• Navigate to the pledge screen and rotate to landscape. There should be no crash. Repeat by increasing dynamic type size - there should be no crash.
• Navigate to the update pledge screen and rotate to landscape. There should be no crash. Repeat by increasing dynamic type size - there should be no crash.

[justinswart]

A strange crash and strange fix! But great job digging into this 👏