[Usability] Save and Load assessment dialog

[ferBonnin]

Describe the bug

After saving an assessment, users can be confused on how to load it.
Some users might try to load it directly from their downloads folder instead of using the load assessment button

Expected behavior

After downloading an assessment, show a dialog with a "don't show this again" option that lets user know the assessment can be loaded again using the "load assessment" feature in the command bar.

Screenshots

dialog that says: Assessment saved
To load this assessment, use the Load assessment button in the Accessibility Insights Assessment command bar
Load assessment should be bolded

Context (please complete the following information)

• OS Name & Version: N/A
• AI-Web Version & Environment: Prod 2.32
• Browser Version: N/A
• Target Page: N/A

Are you willing to submit a PR?

No

Did you search for similar existing issues?

Yes

Additional context

There is a similar dialog in the Tabstops feature, when possible automated failures are found

[ghost]

This issue has been marked as ready for team triage; we will triage it in our weekly review and update the issue. Thank you for contributing to Accessibility Insights!

[ferBonnin]

verified in canary Version 2022.9.20.1622