Move test-suite-graal app classes into test to appease sonar

Also, remove unrequired stuff from build

test-suite-graal/build.gradle

@@ -1,34 +1,28 @@
 plugins {
-    id "io.micronaut.application"
+    id "io.micronaut.library"
     id "io.micronaut.build.internal.cassandra-native-tests"
 }
 
-mainClassName = "example.Application"
 micronaut {
     importMicronautPlatform = false
     testRuntime "junit5"
     enableNativeImage false
     processing {
         incremental(true)
-        annotations("example.*")
+        annotations("io.micronaut.cassandra.graaltest")
     }
     testResources {
         clientTimeout = 600
     }
 }
 
-configurations.all {
-    resolutionStrategy.dependencySubstitution {
-        substitute module('io.micronaut.cassandra:micronaut-cassandra') using project(':micronaut-cassandra')
-    }
-}
-
 dependencies {
-    implementation mn.micronaut.context
-    implementation mn.micronaut.jackson.databind
-    implementation projects.micronautCassandra
-    implementation mn.snakeyaml
-    runtimeOnly mnLogging.logback.classic
+    testImplementation(projects.micronautCassandra)
 
+    testImplementation(mn.micronaut.context)
+    testImplementation(mn.micronaut.jackson.databind)
     testImplementation(mnTest.micronaut.test.junit5)
+
+    testRuntimeOnly(mn.snakeyaml)
+    testRuntimeOnly(mnLogging.logback.classic)
 }