Use new ChangeKeyPopup implementation with validation

[cdawei]

Pull Request Details

What issue does this PR address

• Demonstrate the implementation of https://github.com/anusii/solidpod/issues/162

• Link to associated issue: https://github.com/anusii/solidpod/issues/162

Checklist

Complete the check-list below to ensure your branch is ready for PR.

Flutter Style Guide: https://survivor.togaware.com/gnulinux/flutter-style.html

• [x] Screenshots included in linked issue
• [x] Changes adhere to the team style and coding guideline
• [x] No confidential information
• [x] No duplicated content
• [ ] No lint check errors related to your changes (make prep or flutter analyze lib)
• [ ] Pre-exisiting lint errors noted: [HERE]
• [x] Tested on at least one device
  • [ ] Android Phone
  • [ ] Android Emulator
  • [ ] Chrome on Android
  • [ ] Chrome
  • [ ] iOS
  • [x] Linux
  • [ ] MacOS
  • [ ] Windows
• [x] Added 2 reviewers (or 1 for private repositories then they add another)

Finalising

Once PR discussion is complete and 2 reviewers have approved:

• [ ] Merge dev into the branch
• [ ] Resolve any conflicts
• [x] Add one line summary into CHANGELOG.md
• [x] Bump appropriate version number in pubspec.yaml
• [x] Push to git repository and review
• [x] Merge PR into dev

[github-actions[bot]]

LCOV of commit 99d55c6 during Code Coverage Check #293

Summary coverage rate:
  lines......: 100.0% (5 of 5 lines)
  functions..: no data found
  branches...: no data found

Files changed coverage rate: n/a

[github-actions[bot]]

LCOV of commit 2477cbd during Code Coverage Check #295

Summary coverage rate:
  lines......: 100.0% (5 of 5 lines)
  functions..: no data found
  branches...: no data found

Files changed coverage rate: n/a

[github-actions[bot]]

LCOV of commit bd867ce during Code Coverage Check #296

Summary coverage rate:
  lines......: 100.0% (5 of 5 lines)
  functions..: no data found
  branches...: no data found

Files changed coverage rate: n/a