Remove coherence-grpc-client-helidon tests from the build

(merge main -> ce/main 118405)

[git-p4: depot-paths = "//dev/coherence-ce/main/": change = 118406]

Author: Jonathan Knight

prj/test/functional/grpc-client-helidon/pom.xml

@@ -119,7 +119,7 @@
 
   <profiles>
     <profile>
-      <id>stage8</id>
+      <id>stage8999</id>
       <properties>
         <skipTests>${is.not.java.21}</skipTests>
       </properties>