MRVA: Add open on GitHub action to cancelled/failed queries

[charisk]

Allowed the "open on GitHub" action to cancelled/failed queries.

When a query fails, we set a value on the tree item to "cancelledResultsItem" (see here) - we then use that to decide whether to show the action or not. So the code could do with a bit of refactoring as it suggests that it only deals with cancelled queries, when in fact it deals with any failed queries. However, I won't be making that refactoring as part of this work.

Checklist

N/A:

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[shati-patel]

Simple but effective 😁 Thanks! 🚢