[SPARK-49523][CONNECT] Increase maximum wait time for connect server to come up for testing

### What changes were proposed in this pull request?
This PR increases the max time we wait for a connect server to come up for testing. The current threshold is too low, and is causing flakyness.

### Why are the changes needed?
It makes connect tests less flaky.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
It is test infra code.

### Was this patch authored or co-authored using generative AI tooling?
No.

Closes #47994 from WweiL/deflake-will-it-work.

Authored-by: Wei Liu <[email protected]>
Signed-off-by: Herman van Hovell <[email protected]>

Author: WweiL

connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/test/RemoteSparkSession.scala

@@ -24,6 +24,9 @@ import java.util.concurrent.TimeUnit
 import scala.concurrent.duration.FiniteDuration
 
 import org.scalatest.{BeforeAndAfterAll, Suite}
+import org.scalatest.concurrent.Eventually.eventually
+import org.scalatest.concurrent.Futures.timeout
+import org.scalatest.time.SpanSugar._
 
 import org.apache.spark.SparkBuildInfo
 import org.apache.spark.sql.SparkSession
@@ -184,12 +187,14 @@ object SparkConnectServerUtils {
           .port(port)
           .retryPolicy(RetryPolicy
             .defaultPolicy()
-            .copy(maxRetries = Some(7), maxBackoff = Some(FiniteDuration(10, "s"))))
+            .copy(maxRetries = Some(10), maxBackoff = Some(FiniteDuration(30, "s"))))
           .build())
       .create()
 
     // Execute an RPC which will get retried until the server is up.
-    assert(spark.version == SparkBuildInfo.spark_version)
+    eventually(timeout(1.minute)) {
+      assert(spark.version == SparkBuildInfo.spark_version)
+    }
 
     // Auto-sync dependencies.
     SparkConnectServerUtils.syncTestDependencies(spark)