IT: Drop dead stuff (#1951)

These are ancient ITs that are and were disabled forever. They were compiled, their resources copied and all, just to not contribute anything to build/ITs.

Author: cstamas

its/core-it-suite/pom.xml

@@ -520,8 +520,6 @@ under the License.
             <maven.test.tmpdir>${project.build.testOutputDirectory}</maven.test.tmpdir>
             <maven.version>${maven.version}</maven.version>
             <maven.home>${preparedMavenHome}</maven.home>
-            <!-- TODO: This is for now legacy as Verifier is confused otherwise -->
-            <maven.mainClass>org.apache.maven.cli.MavenCli</maven.mainClass>
             <maven.it.global-settings.dir>${project.build.testOutputDirectory}</maven.it.global-settings.dir>
           </systemPropertyVariables>
         </configuration>