Add a test for the scan status within SubmissionViewModel.kt

[tobiasdroste]

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Description

This PR adds a test for the scan status of the SubmissionViewModel. It tests whether the scan status changes to the right status after starting and when the validateAndStoreTestGUID gets a valid or invalid guid passed.

[tobiasdroste]

The tests on CircleCI all passed. Sonar doesn't seem to work though:
ERROR: Error during SonarQube Scanner execution
ERROR: Parameter 'sonar.pullrequest.branch' is mandatory for a pull request analysis

[tobiasdroste]

Is anything missing here so this can be merged?

[Fabian-K]

Thank your @tobiasdroste for being patient and of course your contribution! LGTM