Try to workaround the metaspace error (#2183)

* Fork a gradle daemon even more often to try to workaround a MetaSpace error

See #2175 (comment)

* Fork every test

Author: martinbonnin

apollo-gradle-plugin/build.gradle.kts

@@ -33,7 +33,7 @@ tasks.withType<Test> {
   // It's not clear if it's a real ClassLoader leak or something else. The okio timeout thread does hold some ClassLoaders
   // for up to 60s. The heap dumps also show some process reaper threads but it might just as well be a temporary thing, not sure.
   // See https://github.com/gradle/gradle/issues/8354
-  setForkEvery(8L)
+  setForkEvery(1L)
   dependsOn(":apollo-api:publishAllPublicationsToPluginTestRepository")
   dependsOn(":apollo-compiler:publishAllPublicationsToPluginTestRepository")
   dependsOn("publishAllPublicationsToPluginTestRepository")