fix(NODE-3521): remove extra server selection

Author: durran

src/operations/execute_operation.ts

@@ -77,14 +77,6 @@ export function executeOperation<
   }
 
   return maybePromise(callback, cb => {
-    if (topology.shouldCheckForSessionSupport()) {
-      return topology.selectServer(ReadPreference.primaryPreferred, err => {
-        if (err) return cb(err);
-
-        executeOperation<T, TResult>(topology, operation, cb);
-      });
-    }
-
     // The driver sessions spec mandates that we implicitly create sessions for operations
     // that are not explicitly provided with a session.
     let session: ClientSession | undefined = operation.session;

src/sdam/topology.ts

@@ -630,17 +630,6 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
 
   // Sessions related methods
 
-  /**
-   * @returns Whether the topology should initiate selection to determine session support
-   */
-  shouldCheckForSessionSupport(): boolean {
-    if (this.description.type === TopologyType.Single) {
-      return !this.description.hasKnownServers;
-    }
-
-    return !this.description.hasDataBearingServers;
-  }
-
   /** Start a logical session */
   startSession(options: ClientSessionOptions, clientOptions?: MongoOptions): ClientSession {
     const session = new ClientSession(this, this.s.sessionPool, options, clientOptions);