fix: fix class cast exception seen on MySQL plugin when built on local setup (#14099)

* fix class cast exception by removing all netty.io packages from mysql r2dbc
* fix CI test failure

app/server/appsmith-plugins/mysqlPlugin/pom.xml

@@ -54,6 +54,10 @@
             <artifactId>r2dbc-mysql</artifactId>
             <version>0.8.2.RELEASE</version>
             <exclusions>
+                <exclusion>
+                    <groupId>io.netty</groupId>
+                    <artifactId>*</artifactId>
+                </exclusion>
                 <exclusion>
                     <groupId>org.slf4j</groupId>
                     <artifactId>slf4j-api</artifactId>
@@ -69,6 +73,12 @@
             </exclusions>
         </dependency>
 
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-all</artifactId>
+            <scope>provided</scope>
+        </dependency>
+
         <!-- Test Dependencies -->
         <dependency>
             <groupId>mysql</groupId>