Fixed bugs

FIRE-1111 Remove test object from test and add it back

• Bug: If you remove a test object from a test and add it to the test from the evaluation or the data pool, the current, new and changed attributes are not adopted. This also applies to the documents and the image on the test object.
• Solution: If a test object is added to a test, even if it was removed from the test shortly before, all current, new or changed attributes as well as documents and images are added. If a test object is changed in the data pool, the changes are now included in the test if the test object is removed and re-imported into the test.