Purpose

[DYN-6536]
[DYN-5867]
[DYN-5868]

This PR fixes:

• Remove Sign In menu arrow when no submenu item is present.
• Add a confirmation dialog box on sign out
• Consistent sign-in and sign-out UX
• Update Run Preview option tooltip

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

• Remove Sign In menu arrow when no submenu item is present.
• Add a confirmation dialog box on sign out
• Update Run Preview option tooltip

Reviewers

@DynamoDS/dynamo