fix: remove sniffer plugin and comments

pom.xml

@@ -241,33 +241,14 @@
             <autoReleaseAfterClose>true</autoReleaseAfterClose>
           </configuration>
         </plugin>
-        <plugin>
-          <groupId>org.codehaus.mojo</groupId>
-          <artifactId>animal-sniffer-maven-plugin</artifactId>
-          <version>1.22</version>
-          <configuration>
-            <signature>
-              <groupId>org.codehaus.mojo.signature</groupId>
-              <artifactId>java18</artifactId>
-              <version>1.0</version>
-            </signature>
-            <ignores>
-              java.net.http.*
-            </ignores>
-          </configuration>
-          <!--<executions>
-            <execution>
-              <id>ensure-java-1.8-class-library</id>
-              <phase>test</phase>
-              <goals>
-                <goal>check</goal>
-              </goals>
-            </execution>
-          </executions>-->
-        </plugin>
       </plugins>
     </pluginManagement>
     <plugins>
+      <!--
+      This plugin is used to generate AOT metadata during tests so that it can be
+      compared against those in META-INF/native-image/org.kohsuke/github-api/*.
+      The tests are located in src/test/java/org.kohsuke.aot
+      -->
       <plugin>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
@@ -511,6 +492,10 @@
       <version>${hamcrest.version}</version>
       <scope>test</scope>
     </dependency>
+    <!--
+    This plugin is used to start a spring boot application during tests
+    to generate AOT metadata. See also spring-boot-maven-plugin
+    -->
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-test</artifactId>
@@ -548,6 +533,7 @@
       <version>4.2.1</version>
       <scope>test</scope>
     </dependency>
+    <!-- junit vintage engine is used because junit4 and junit5 tests are required -->
     <dependency>
       <groupId>org.junit.vintage</groupId>
       <artifactId>junit-vintage-engine</artifactId>