Rename Sample files to match Surefire convention and update class declarations

Author: Changjian Wang

sdk/contentunderstanding/azure-ai-contentunderstanding/pom.xml

@@ -43,11 +43,10 @@
   </developers>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <!-- Disable code coverage checks for this beta release as tests are still being developed -->
-    <jacoco.min.linecoverage>0</jacoco.min.linecoverage>
-    <jacoco.min.branchcoverage>0</jacoco.min.branchcoverage>
+    <jacoco.min.linecoverage>0.40</jacoco.min.linecoverage>
+    <jacoco.min.branchcoverage>0.30</jacoco.min.branchcoverage>
     <!-- Exclude generated sample files from Checkstyle validation -->
-    <checkstyle.excludes>**/generated/Sample*.java,**/samples/Sample*.java</checkstyle.excludes>
+    <checkstyle.excludes>**/generated/Sample*Test.java,**/samples/Sample*.java</checkstyle.excludes>
   </properties>
   <dependencies>
     <dependency>