cloud_storage/tests: match topic name when deleting manifest

when deleting manifest in test_missing_partition we should match topic
name with the manifest path.

tests/rptest/tests/topic_recovery_test.py

@@ -345,7 +345,8 @@ class MissingPartition(BaseCase):
     only one key).
     """
 
-    topics = (TopicSpec(name='panda-topic',
+    topic_name = 'panda-topic'
+    topics = (TopicSpec(name=topic_name,
                         partition_count=2,
                         replication_factor=3), )
 
@@ -379,7 +380,7 @@ def _find_and_remove_partition_manifest(self):
         for key in self._list_objects():
             if key.endswith("/manifest.json"):
                 attr = parse_s3_manifest_path(key)
-                if attr.ntp.partition == 0:
+                if attr.ntp.partition == 0 and attr.ntp.topic == self.topic_name:
                     manifest = key
                 else:
                     assert attr.ntp.partition == 1