DYN-7255 Add crash guard code to DependencyRegen function and code clean up

[QilongTang]

Purpose

Per https://jira.autodesk.com/browse/DYN-7255 and #15404. Add crash guard code to DependencyRegen function to avoid Workspace References view extension to crash and code clean up

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

Add crash guard code to DependencyRegen function to avoid Workspace References view extension to crash and code clean up

Reviewers

@DynamoDS/dynamo

FYIs

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[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-7255

[github-actions]

UI Smoke Tests

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

[RobertGlobant20]

LGTM