config: enable remote labels by default

With this activated in tests, updates several tests that now need to
account for the new paths.

src/v/config/configuration.cc

@@ -2169,8 +2169,7 @@ configuration::configuration()
       "naming scheme for new topics. This property exists to simplify testing "
       "and shouldn't be set in production.",
       {.needs_restart = needs_restart::no, .visibility = visibility::tunable},
-      // TODO(awong): enable once stable
-      true)
+      false)
   , cloud_storage_azure_storage_account(
       *this,
       "cloud_storage_azure_storage_account",

tests/rptest/tests/archival_test.py

@@ -814,8 +814,8 @@ def _get_redpanda_s3_checksums(self):
         """Get MD5 checksums of log segments stored in S3 (minio). The paths are
         normalized (<namespace>/<topic>/<partition>_<rev>/...)."""
         def normalize(path):
-            # strip archiver term id from the segment path
-            path = path[9:]
+            # strip archiver cluster UUID prefix from the segment path
+            path = path[37:]
             match = LOG_EXPRESSION.match(path)
             if match:
                 return match[1]