Cleanup SentryClient API

Author: vepanimas

src/main/com/intellij/lang/jsgraphql/ide/diagnostic/GraphQLSentryClient.java

@@ -4,7 +4,7 @@
 import io.sentry.SentryEvent;
 import org.jetbrains.annotations.NotNull;
 
-public class GraphQLSentryClient {
+public final class GraphQLSentryClient {
     private static class Lazy {
         private static final GraphQLSentryClient ourClient = new GraphQLSentryClient();
     }
@@ -13,7 +13,7 @@ public static GraphQLSentryClient getInstance() {
         return Lazy.ourClient;
     }
 
-    public GraphQLSentryClient() {
+    private GraphQLSentryClient() {
         Sentry.init(options -> options.setDsn("https://[email protected]/6097822"));
     }