[DYN-4361] Revert changed to WatchTree

[ivaylo-matov]

Purpose

Reverts the changes made to WatchTree. Text from TreeViewItems can not longer be copied, but the up/down navigation functionality is back.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

Reverts the changes made to WatchTree. Text from TreeViewItems can not longer be copied, but the up/down navigation functionality is back.

Reviewers

@QilongTang
@reddyashish

FYIs

@dnenov

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-4361

[github-actions]

UI Smoke Tests

Test: success. 11 passed, 0 failed.
TestComplete Test Result
Workflow Run: UI Smoke Tests
Check: UI Smoke Tests

[reddyashish]

Passed: https://master-5.jenkins.autodesk.com/job/Dynamo/job/DynamoSelfServe/job/pullRequestValidation/16918/