Mark graph modified when group IsExpanded state is changed

[SHKnudsen]

Purpose

This PR marks the graph as modified when the IsExpanded state is changed.
Related to DYN-3890

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

Reviewers

@QilongTang

FYIs

[QilongTang]

Would you add a unit test for it?

[SHKnudsen]

@QilongTang added a test for this

[QilongTang]

@SHKnudsen Perfect. Waiting for unit test pipeline to pass before merging.

[QilongTang]

The regression failure test is due to other changes by our team, merging