Increase timeout in DataStreamLifecycleDownsampleDisruptionIT (#122151) (#122156)

The downsample task sometimes needs a little bit longer to complete so
we bump the timeout from 60s to 120s.

Fixes #122056

(cherry picked from commit 0ec2fe0)

# Conflicts:
#	muted-tests.yml

Author: nielsbauman

x-pack/plugin/downsample/src/internalClusterTest/java/org/elasticsearch/xpack/downsample/DataStreamLifecycleDownsampleDisruptionIT.java

@@ -119,7 +119,7 @@ public void testDataStreamLifecycleDownsampleRollingRestart() throws Exception {
             } catch (Exception e) {
                 throw new AssertionError(e);
             }
-        }, 60, TimeUnit.SECONDS);
+        }, 120, TimeUnit.SECONDS);
         ensureGreen(targetIndex);
     }
 }