drop sonar project form widget if project deleted

[alzafacon]

Affects: all versions.

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imagine:

1. code quality widget is configured with sonar project named "quuz-bar"
2. sonar project "quux-bar" is deleted from sonar

The user will see a warning that the says NOT FOUND on the white status bubble. This is not very helpful since the user does not know what was NOT FOUND.

3. user recreates sonar project "quux-bar"
4. AAAAHHHH!!! now there are duplicates in the database and mongo will start to through exceptions

This PR will remove the deleted sonar project from any widgets that previously had it configured. Thus preventing user confusion about what was NOT FOUND and database duplicates.

[Courtneyp123]

@fidelcoria-aa "This branch is out-of-date with the base branch" - could you update please?

[rvema]

lgtm