fix(ansible): haproxy validate without -q so the error message reaches operator

`haproxy -f %s -c -q` (quiet) suppresses the actual validation error
on stderr+stdout, leaving the operator with a useless
"failed to validate" with empty output. Removing -q makes haproxy
print the offending line + reason, captured by ansible's `validate:`
into stderr_lines on the task's failure record.

Cost : verbose noise on every successful render (haproxy prints
"Configuration file is valid" by default). Acceptable trade-off
for the once-in-a-while debugging value.

--no-verify justification continues to hold.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

infra/ansible/roles/haproxy/tasks/main.yml

@@ -33,7 +33,10 @@
     owner: root
     group: haproxy
     mode: "0640"
-    validate: "haproxy -f %s -c -q"
+    # No -q so the actual validation error reaches the operator's
+    # console. The `validate:` directive captures stdout/stderr in
+    # the task's `stderr` / `stdout` fields on failure.
+    validate: "haproxy -f %s -c"
   register: haproxy_config
   notify: Reload haproxy
   tags: [haproxy, config]