Formatter / Remove unused Groovy mode.

Groovy formatter is unused and unmaintained in GeoNetwork.
It is also unused in the (only one?) project which used it (geocat.ch)
since 2 years now.

This PR propose to remove it.

code_quality/findbugs-excludes.xml

@@ -230,15 +230,6 @@
     <Bug pattern="DC_DOUBLECHECK"/>
     <Method name="getSupportedExts"/>
   </Match>
-  <Match>
-    <Class name="org.fao.geonet.api.records.formatters.groovy.util.AssociatedLink"/>
-    <Bug pattern="EQ_DOESNT_OVERRIDE_EQUALS"/>
-    <Method name="equals"/>
-  </Match>
-  <Match>
-    <Class name="org.fao.geonet.api.records.formatters.groovy.util.LinkType"/>
-    <Bug pattern="URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD"/>
-  </Match>
   <Match>
     <Class name="org.fao.geonet.api.regions.ListRegionsResponse"/>
     <Bug pattern="URF_UNREAD_FIELD"/>

pom.xml

@@ -386,19 +386,12 @@
           </exclusion>
         </exclusions>
       </dependency>
-
       <dependency>
         <groupId>org.jsoup</groupId>
         <artifactId>jsoup</artifactId>
         <version>1.15.3</version>
       </dependency>
 
-      <dependency>
-        <groupId>org.codehaus.groovy</groupId>
-        <artifactId>groovy-all</artifactId>
-        <version>2.4.21</version>
-      </dependency>
-
       <!-- universal character set detector -->
       <dependency>
         <groupId>com.googlecode.juniversalchardet</groupId>

schemas-test/pom.xml

@@ -36,10 +36,6 @@
   <name>Tests for schema plugins</name>
 
   <dependencies>
-    <dependency>
-      <groupId>org.codehaus.groovy</groupId>
-      <artifactId>groovy-all</artifactId>
-    </dependency>
     <dependency>
       <groupId>${project.groupId}</groupId>
       <artifactId>gn-services</artifactId>