[DYN-8072] Opening file from home tab should check is workspace has unsaved changes

[ivaylo-matov]

Purpose

This PR addresses DYN-8072 where users were not always prompted to save changes when opening a new graph from the Recent Files section.

Changes Implemented:

• Ensured that AskUserToSaveWorkspaceOrCancel is called when opening a new graph.
• Updated HasUnsavedChanges handling.
  Now, after the user confirms saving or discarding changes, workspace.HasUnsavedChanges is properly set.

Expected Behavior After the Fix:

• If the current graph has unsaved changes, the user will always be prompted before opening a new graph.
• If the user chooses to save or discard changes, HasUnsavedChanges is correctly updated.

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

Changes Implemented:

• Ensured that AskUserToSaveWorkspaceOrCancel is called when opening a new graph.
• Updated HasUnsavedChanges handling.
  Now, after the user confirms saving or discarding changes, workspace.HasUnsavedChanges is properly set.

Expected Behavior After the Fix:

• If the current graph has unsaved changes, the user will always be prompted before opening a new graph.
• If the user chooses to save or discard changes, HasUnsavedChanges is correctly updated.

Reviewers

@QilongTang
@reddyashish

FYIs

@dnenov
@achintyabhat

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-8072

[zeusongit]

@ivaylo-matov Can you address the conflicts? Thanks.

[ivaylo-matov]

@ivaylo-matov Can you address the conflicts? Thanks.

done! Thanks!