Skip revapi check for the microbench (#12718)

Motivation:
We should be able to evolve and change our benchmark code and infrastructure without worrying about compatibility.

Modification:
Skip revapi check for the microbench module and remove benchmarking specific configuration from the revapi plugin.

Result:
The microbench module is no longer subject to compatibility checks.

Co-authored-by: ahadadi <ahadadi@outbrain.com>

microbench/pom.xml

@@ -39,6 +39,7 @@
          code -->
     <kqueue.classifier />
     <japicmp.skip>true</japicmp.skip>
+    <revapi.skip>true</revapi.skip>
     <javaModuleName>io.netty.microbench</javaModuleName>
   </properties>
   <profiles>

pom.xml

@@ -1087,10 +1087,6 @@
                     <matcher>java-package</matcher>
                     <match>/.*\.internal\..*/</match>
                   </item>
-                  <item>
-                    <matcher>java-package</matcher>
-                    <match>/io\.netty\.microbench\..*/</match>
-                  </item>
                   <item>
                     <matcher>java-package</matcher>
                     <match>/org\.openjdk\.jmh\..*/</match>
@@ -1130,13 +1126,6 @@
                   <package>io\.netty\..*</package>
                   <justification>They're not "external classes" if they're from a Netty package.</justification>
                 </item>
-                <item>
-                  <ignore>true</ignore>
-                  <code>java.class.removed</code>
-                  <regex>true</regex>
-                  <package>.*\.generated($|\..+)</package>
-                  <justification>Ignore all classes generated by JMH.</justification>
-                </item>
                 <item>
                   <ignore>true</ignore>
                   <code>java.field.removed</code>