Fix target platform due to outdates p2 update sites

* build.sh
 * Removes obsolete soa profile

* pom.xml
 * Bases TP on the integration stack platform base rather than obsolete
   soatools. This is consistent with what will be released for jbt4/jbds6

* teiid-designer.target
 * Newly generated using generate-target profile

* test manifests
 * org.objnesis is not included in the integration stack TP and is not
   required in test plugins anyway since locus' mockito carries its own
   internal objnesis. Thus, this is removing unrequired dependencies.