Cherry-pick of #15981 to RC3.5.0_master

Purpose

Task: https://jira.autodesk.com/browse/DYN-6039

Shows a toast notification after exporting the workspace as an image.

We don't the functionality to open the folder from the toast notification, so just showing the message with the location where it was saved. The option to open the folder from toast notification can be implemented as an improvement later on if needed.

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

[DYN-6039] Toast notification for exporting images.

Reviewers

@zeusongit