chore(integration): match the resolved endpoint before its version prefix

The previous pattern looked for endpoint_url, which is the request URL and
carries a version prefix, so it did not match and would have needed an
update on every version bump. Match configured_endpoint instead, which is
the endpoint resolved from configuration.

Log fields are rendered with surrounding quotes, so include them.

Author: webern

test/integration/cases/adp-config-stream/config.yaml

@@ -29,11 +29,13 @@ procedure:
     pattern: "Waiting for initial configuration from Datadog Agent"
     timeout: 60s
   # The forwarder starts one endpoint I/O task per resolved endpoint before any payload is sent, and
-  # each one reports the URL it will send to. Matching that URL confirms the streamed site reached
-  # endpoint resolution, and that the defaulted dd_url did not silently take its place. This depends
-  # on the endpoint_url field of the "Starting endpoint I/O task." record.
+  # each one reports the endpoint it resolved from configuration. Matching that endpoint confirms the
+  # streamed site reached endpoint resolution, and that the defaulted dd_url did not silently take
+  # its place. This depends on the configured_endpoint field of the "Starting endpoint I/O task."
+  # record, which is the endpoint before the version prefix is applied. The sibling endpoint_url
+  # field carries that prefix, so it embeds the ADP version and is not matched here.
   - assertion: log_contains
-    pattern: "endpoint_url:https://app\\.datadoghq\\.eu"
+    pattern: 'configured_endpoint:"https://app\.datadoghq\.eu"'
     regex: true
     timeout: 60s
   # The same site, read back from the translated runtime configuration that components are built