Close view when variant analyis is deleted from query history

[koesie10]

This will close the variant analysis view when the corresponding variant analysis history item is deleted from the query history. This required some extra code to handle dispose being called on the view to ensure this actually disposes the panel, but we can now call dispose() on the view to close it.

Checklist

• 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.
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