AXIOM-506: Move TextDataSource to axiom-legacy-attachments

That's the only remaining module using that class.
diff --git a/axiom-legacy-attachments/pom.xml b/axiom-legacy-attachments/pom.xml
index 64b3791..3586232 100644
--- a/axiom-legacy-attachments/pom.xml
+++ b/axiom-legacy-attachments/pom.xml
@@ -64,12 +64,6 @@
         </dependency>
         <dependency>
             <groupId>${project.groupId}</groupId>
-            <artifactId>activation-testutils</artifactId>
-            <version>${project.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>${project.groupId}</groupId>
             <artifactId>blob-testutils</artifactId>
             <version>${project.version}</version>
             <scope>test</scope>
@@ -80,6 +74,11 @@
             <version>${project.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/AttachmentsTest.java b/axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/AttachmentsTest.java
index ce6b6ea..49c7c08 100644
--- a/axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/AttachmentsTest.java
+++ b/axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/AttachmentsTest.java
@@ -56,7 +56,6 @@
 import org.apache.axiom.om.AbstractTestCase;
 import org.apache.axiom.om.OMException;
 import org.apache.axiom.om.impl.MTOMConstants;
-import org.apache.axiom.testutils.activation.TextDataSource;
 import org.apache.axiom.testutils.blob.RandomBlob;
 import org.apache.axiom.testutils.io.ExceptionInputStream;
 import org.apache.axiom.testutils.io.IOTestUtils;
diff --git a/testing/activation-testutils/src/main/java/org/apache/axiom/testutils/activation/TextDataSource.java b/axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/TextDataSource.java
similarity index 97%
rename from testing/activation-testutils/src/main/java/org/apache/axiom/testutils/activation/TextDataSource.java
rename to axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/TextDataSource.java
index d582e95..60b8755 100644
--- a/testing/activation-testutils/src/main/java/org/apache/axiom/testutils/activation/TextDataSource.java
+++ b/axiom-legacy-attachments/src/test/java/org/apache/axiom/attachments/TextDataSource.java
@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.apache.axiom.testutils.activation;
+package org.apache.axiom.attachments;
 
 import java.io.IOException;
 import java.io.InputStream;
diff --git a/testing/activation-testutils/pom.xml b/testing/activation-testutils/pom.xml
deleted file mode 100644
index 33027be..0000000
--- a/testing/activation-testutils/pom.xml
+++ /dev/null
@@ -1,59 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Licensed to the Apache Software Foundation (ASF) under one
-  ~ or more contributor license agreements. See the NOTICE file
-  ~ distributed with this work for additional information
-  ~ regarding copyright ownership. The ASF licenses this file
-  ~ to you under the Apache License, Version 2.0 (the
-  ~ "License"); you may not use this file except in compliance
-  ~ with the License. You may obtain a copy of the License at
-  ~
-  ~ http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing,
-  ~ software distributed under the License is distributed on an
-  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-  ~ KIND, either express or implied. See the License for the
-  ~ specific language governing permissions and limitations
-  ~ under the License.
-  -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <parent>
-        <groupId>org.apache.ws.commons.axiom</groupId>
-        <artifactId>testing</artifactId>
-        <version>2.0.0-SNAPSHOT</version>
-    </parent>
-
-    <artifactId>activation-testutils</artifactId>
-
-    <url>http://ws.apache.org/axiom/</url>
-
-    <dependencies>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>jakarta.activation</groupId>
-            <artifactId>jakarta.activation-api</artifactId>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>com.spotify.fmt</groupId>
-                <artifactId>fmt-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>check</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-</project>
diff --git a/testing/pom.xml b/testing/pom.xml
index 2e390da..994a0b0 100644
--- a/testing/pom.xml
+++ b/testing/pom.xml
@@ -46,7 +46,6 @@
         <module>jaxp-testsuite</module>
         <module>url-registry</module>
         <module>blob-testutils</module>
-        <module>activation-testutils</module>
     </modules>
 
     <build>