ducktape: Fix topic recovery e2e test

Fixes redpanda-data#5474 'Not all data is uploaded to S3 bucket'.
The problem is caused by the fact that we're generating huge number of
segments in this test (message size was 10000, and number of messages
was 100000). This commit decreases the message size to 5000 and
increases the timeout for upload to 10 minutes.

tests/rptest/tests/e2e_topic_recovery_test.py

@@ -106,7 +106,7 @@ def _restore_topic(self, topic_spec, overrides={}):
         rpk.describe_topic_configs(topic)
 
     @cluster(num_nodes=4)
-    @matrix(message_size=[10000],
+    @matrix(message_size=[5000],
             num_messages=[100000],
             recovery_overrides=[{}, {
                 'retention.bytes': 1024
@@ -143,7 +143,7 @@ def s3_has_all_data():
 
         time.sleep(10)
         wait_until(s3_has_all_data,
-                   timeout_sec=300,
+                   timeout_sec=600,
                    backoff_sec=5,
                    err_msg=f"Not all data is uploaded to S3 bucket")