test(telemetry): name the metrics under test instead of plan task numbers

The integration-test sections, alert provisioning headers and a naming-check
test comment were indexed by rollout phase and task numbers defined only in
planning documents outside the shipped tree. Each now names what it covers.

.github/scripts/otel-naming/test_check_otel_naming.py

@@ -509,7 +509,7 @@ class RuleEAllowDottedMarkerEnforcement(unittest.TestCase):
         )
 
     def test_all_named_keys_exempt_on_a_table_row(self):
-        # The real shape in the plan docs: a "was -> is now" row naming two old
+        # The real-world shape: a "was -> is now" row naming two old
         # dotted keys, with both listed in the marker.
         tokens, _ = _run_rule_e_docs(
             {