handle passing dimension test

[ofek1weiss]

trafficstars

currently, when a dimension anomalies test passes, two weird things happen in the report:

its "Test Type" is set to "generic" (instead of "dimension")

when expanding it, it shows "Not enough data to calculate anomaly score", which is incorrect

fixes:

change the test type to "dimension"

[linear[bot]]

ELE-2338 fix report for passing dimension tests

[github-actions[bot]]

👋 @ofek1weiss Thank you for raising your pull request. Please make sure to add tests and document all user-facing changes. You can do this by editing the docs files in the elementary repository.

[haritamar]

Closing after discussing with @ofek1weiss , we'll reopen if relevant