MNT Add test objects

tests/Tasks/DocblockTagWriterTaskTest/TestExtension.php

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+<?php
+
+namespace SilverStripe\DocblockWriter\Tests\Tasks\DocblockTagWriterTaskTest;
+
+use SilverStripe\Core\Extension;
+
+class TestExtension extends Extension
+{
+    private static $has_one = [
+        'SomeHasOne' => TestObjectB::class,
+    ];
+}

tests/Tasks/DocblockTagWriterTaskTest/TestService.php

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+<?php
+
+namespace SilverStripe\DocblockWriter\Tests\Tasks\DocblockTagWriterTaskTest;
+
+/**
+ * This class does nothing, it exists purely to test that it is not processed by the task
+ * because it is not a DataObject or Extension
+ */
+class TestService
+{
+}