chore: remove Quarkus sample since one is provided in the extension

See
https://github.com/quarkiverse/quarkus-operator-sdk/tree/master/samples
Fixes operator-framework#386

Author: metacosm

samples/pom.xml

@@ -17,7 +17,6 @@
     <modules>
         <module>common</module>
         <module>pure-java</module>
-        <module>quarkus</module>
         <module>spring-boot-plain</module>
         <module>spring-boot-auto-config</module>
     </modules>