Rename pause to interact to be clearer on intent.

[gjwgit]

Pull Request Details

What issue does this PR address

• Better name for the testing dealy variable pause

• No linked issue

Checklist

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

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• [ ] Screenshots included in linked issue
• [x] Changes adhere to the style and coding guideline
• [x] No confidential information
• [ ] No duplicated content
• [ ] No lint check errors related to your changes (make prep or flutter analyze lib)
• [ ] Pre-exisiting lint errors noted: [HERE]
• [x] Integration test make qtest.tmp screenshot included in issue
• [x] Tested on device:
  • [x] Linux
  • [ ] MacOS
  • [ ] Windows
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Finalising

Once PR discussion is complete and reviewers have approved:

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

[gjwgit]

make demo_model_tree.qtest succeeded separately.