* In the decompose mechanism, the constrained instances are duplicated
  since the resolution of #3293. It is sufficient to remove the
  contrained instances from the container by clearing the list since
  the hierarchical decomposition takes care of the destruction of
  contained specifications.
* Tests: Deleting a component with a test suite succeeds, deleting
  test suites and test suite specs succeeds. The "All tests pass"
  constraint seems to work: It is marked green in a one-component system
  with a "successful" test suite (NOTE: there are currently focus
  problems, so one might need to click into the navigator).

Issue-Ref: 3523
Issue-Url: https://af3-developer.fortiss.org/issues/3523


Signed-off-by: Alexander Diewald <diewald@fortiss.org>