rptest: adjust compaction settings in datalake/compaction_test

Because we now schedule adjacent segment compaction after sliding
window compaction, this test was having trouble trying to reach
the desired number of segments while producing.

Increase the timeout as well as the `log_compaction_interval_ms`
to allow the test to reach the desired number of segments.

tests/rptest/tests/datalake/compaction_test.py

@@ -35,7 +35,7 @@ def __init__(self, test_ctx, *args, **kwargs):
                 "iceberg_enabled": "true",
                 "iceberg_catalog_commit_interval_ms": 5000,
                 "datalake_coordinator_snapshot_max_delay_secs": 10,
-                "log_compaction_interval_ms": 2000
+                "log_compaction_interval_ms": 5000
             },
             *args,
             **kwargs)
@@ -66,7 +66,7 @@ def wait_until_segment_count(self, count):
             err_msg=f"Timed out waiting for segment count to reach {count}")
 
     def produce_until_segment_count(self, count):
-        timeout_sec = 30
+        timeout_sec = 60
         deadline = time() + timeout_sec
         while True:
             current_segment_count = self.partition_segments()