chore(csharp/test/Drivers/Databricks): Skip StatusPollerKeepsQueryAlive in CI test (#3155)

## Motivation 

The test `StatementTest:StatusPollerKeepsQueryAlive` runs 30 minutes as
it tests if Databricks connection is still alive after 30 idle time
after using KeepAlive poller, which is not applicable for CI test. We
should exclude it from the CI.

## Changes
- Skip `StatementTest:StatusPollerKeepsQueryAlive` test when
`TestConfiguration.IsCITesting` is true

Author: jackyhu-db

csharp/test/Drivers/Databricks/E2E/StatementTests.cs

@@ -886,6 +886,8 @@ private async Task PrepareTableAsync(string fullTableName, string sqlResourceLoc
         [InlineData(true, "CloudFetch enabled")]
         public async Task StatusPollerKeepsQueryAlive(bool useCloudFetch, string configName)
         {
+            Skip.If(TestConfiguration.IsCITesting, "Skip test in CI testing");
+
             OutputHelper?.WriteLine($"Testing status poller with long delay between reads ({configName})");
 
             // Create a connection using the test configuration