DYN-9879: Py Engine Change pops up erroneously

[ivaylo-matov]

Purpose

This PR addresses DYN-9879.

Fixes an issue where the “Hide Python engine change notifications” preference did not persist reliably.
Also ensures that WorkspaceModel.ShowPythonAutoMigrationNotifications is reset to false when creating new workspaces.

Declarations

Check these if you believe they are true

• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Release Notes

Fixes an issue where the “Hide Python engine change notifications” preference did not persist reliably.
Also ensures that WorkspaceModel.ShowPythonAutoMigrationNotifications is reset to false when creating new workspaces.

Reviewers

@zeusongit
@DynamoDS/eidos

FYIs

@dnenov
@achintyabhat
@jnealb

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-9879

[Copilot]

Pull Request Overview

This PR fixes an issue where the "Hide Python engine change notifications" user preference was not being respected when displaying Python auto-migration notifications. The fix ensures that both workspace-level and preference-level settings are checked before showing notifications, and properly resets the workspace flag when workspaces are cleared.

Key Changes:

• Added preference setting check to notification display logic to respect user's "Hide" preference
• Reset ShowPythonAutoMigrationNotifications to false when workspace is cleared to prevent stale state

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/PythonMigrationViewExtension/PythonMigrationViewExtension.cs	Resets workspace notification flag on clear and sets flag to true during migration
src/DynamoCoreWpf/Views/Core/DynamoView.xaml.cs	Adds preference setting check to notification display condition

[ivaylo-matov]

The failing test in https://master-5.jenkins.autodesk.com/job/Dynamo/job/DynamoSelfServe/job/pullRequestValidation/18960/ passes locally.

[github-actions]

Successfully created backport PR for RC4.0.0_master:

• [Cherry-pick] DYN-9879: Py Engine Change pops up erroneously #16748