DYN-6993 Add crash protection for window Owner setting

[QilongTang]

Purpose

Per https://jira.autodesk.com/browse/DYN-6993, add crash protection to DynamoMessageBox display code during window owner assignment.

Here is the crash callstack

presentationframework!_NA_::System.Windows.Window.set_Owner(System.Windows.Window)
dynamocorewpf!_NA_::Dynamo.UI.Prompts.DynamoMessageBox.Show(System.Windows.Window, System.String, System.String, System.Windows.MessageBoxButton, System.Windows.MessageBoxImage)
dynamocorewpf!_NA_::Dynamo.Wpf.Utilities.MessageBoxService+DefaultMessageBox.Show(System.Windows.Window, System.String, System.String, System.Windows.MessageBoxButton, System.Windows.MessageBoxImage)
dynamocorewpf!_NA_::Dynamo.Wpf.Utilities.MessageBoxService.Show(System.Windows.Window, System.String, System.String, System.Windows.MessageBoxButton, System.Windows.MessageBoxImage)
dynamocorewpf!_NA_::Dynamo.Controls.DynamoView.DynamoViewModelRequestUserSaveWorkflow(System.Object, Dynamo.ViewModels.WorkspaceSaveEventArgs)
dynamocorewpf!_NA_::Dynamo.ViewModels.DynamoViewModel.OnRequestUserSaveWorkflow(System.Object, Dynamo.ViewModels.WorkspaceSaveEventArgs)
dynamocorewpf!_NA_::Dynamo.ViewModels.DynamoViewModel.AskUserToSaveWorkspacesOrCancel(Boolean)
dynamocorewpf!_NA_::Dynamo.ViewModels.DynamoViewModel.PerformShutdownSequence(ShutdownParams)
dynamocorewpf!_NA_::Dynamo.Controls.DynamoView.PerformShutdownSequenceOnViewModel()
dynamocorewpf!_NA_::Dynamo.Controls.DynamoView.WindowClosed(System.Object, System.EventArgs)
presentationframework!_NA_::System.Windows.Window.WmDestroy()

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 protection to DynamoMessageBox display code during window owner assignment.

Reviewers

@DynamoDS/dynamo

FYIs

(FILL ME IN, Optional) Names of anyone else you wish to be notified of

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-6993

[github-actions]

UI Smoke Tests

Test: success. 2 passed, 0 failed.
TestComplete Test Result
Workflow Run: UI Smoke Tests
Check: UI Smoke Tests - net8.0