[Build] Remove unnecessary resources-plugin executions and set encoding

Java properties files are encoded using ISO-8859-1 encoding. Therefore,
when filtered by the maven-resources-plugin, these files should be
written with that encoding.
Explicit specifying the encoding also prevents the following INFO log
'''
The encoding used to copy filtered properties files has not been set.
This means that the same encoding will be used to copy filtered
properties files as when copying other filtered resources. This might
not be what you want! Run your build with --debug to see which files
might be affected. Read more at
https://maven.apache.org/plugins/maven-resources-plugin/examples/filtering-properties-files.html
'''

Author: HannesWell

eclipse-platform-parent/pom.xml

@@ -277,18 +277,12 @@
         <artifactId>maven-resources-plugin</artifactId>
         <executions>
           <execution>
-            <id>filter-resources</id>
+            <id>saveproperties</id>
             <goals>
-              <goal>resources</goal>
+              <goal>copy-resources</goal>
             </goals>
             <phase>process-resources</phase>
-            <configuration>
-              <outputDirectory>${project.build.directory}/resources</outputDirectory>
-              <escapeString>\</escapeString>
-            </configuration>
-          </execution>
-          <execution>
-            <id>saveproperties</id>
+            <inherited>false</inherited>
             <configuration>
               <outputDirectory>${project.build.directory}</outputDirectory>
               <changeDetection>always</changeDetection>
@@ -298,11 +292,8 @@
                   <filtering>true</filtering>
                 </resource>
               </resources>
+              <propertiesEncoding>ISO-8859-1</propertiesEncoding><!-- Default encoding for Java properties files-->
             </configuration>
-            <phase>validate</phase>
-            <goals>
-              <goal>copy-resources</goal>
-            </goals>
           </execution>
         </executions>
       </plugin>
@@ -990,6 +981,7 @@
                       <filtering>true</filtering>
                     </resource>
                   </resources>
+                  <propertiesEncoding>ISO-8859-1</propertiesEncoding><!-- Default encoding for Java properties files-->
                 </configuration>
                 <goals>
                   <goal>copy-resources</goal>

products/eclipse-junit-tests/pom.xml

@@ -32,13 +32,6 @@
   <build>
     <finalName>${project.artifactId}</finalName>
 
-    <resources>
-      <resource>
-        <directory>src/main/resources</directory>
-        <filtering>true</filtering>
-      </resource>
-    </resources>
-
     <pluginManagement>
       <plugins>
         <plugin>