[MNG-7045] Drop CDI API from Maven

This closes #540

maven-core/src/main/resources/META-INF/maven/extension.xml

@@ -94,9 +94,11 @@ under the License.
 
     <!-- javax.inject (JSR-330) -->
     <exportedPackage>javax.inject.*</exportedPackage>
-    <!-- javax.enterprise.inject (JSR-299) -->
+    <!-- javax.enterprise.inject (JSR-299): Must never be exported if needed at plugin level, plugin adds it
+         there is no justification to get it at Maven level and leaking it will conflict.
     <exportedPackage>javax.enterprise.util.*</exportedPackage>
     <exportedPackage>javax.enterprise.inject.*</exportedPackage>
+    -->
 
     <!-- javax.annotation (JSR-250) -->
     <exportedPackage>javax.annotation.*</exportedPackage>

pom.xml

@@ -249,6 +249,12 @@ under the License.
         <groupId>org.eclipse.sisu</groupId>
         <artifactId>org.eclipse.sisu.plexus</artifactId>
         <version>${sisuVersion}</version>
+        <exclusions>
+          <exclusion> <!-- Way too easy to conflict with plugins to be in Maven and leak in plugins -->
+            <groupId>javax.enterprise</groupId>
+            <artifactId>cdi-api</artifactId>
+          </exclusion>
+        </exclusions>
       </dependency>
       <dependency>
         <groupId>org.eclipse.sisu</groupId>