Allow multiple tests of same type on one entity

[JanPeterDatakind]

Describe your maintenance task
Currently, the test result views are created with a prefix of "tr_dot_model", followed by the names of the entity and the testtype.
Hence, setting up the same testtype twice (e.g. expression is true) on the same entity leads to two views with the same name, which breaks the execution of DOT. This could maybe be prevented by implementing all conditions or specifications for multiple scenarios into one test, but this would complicate the test definition and interpretation of test results.