Describe the bug
When comments are blocked by administrators on a specific component (e.g., proposals, debates), the expected warning message informing participants that comments have been disabled is not displayed on the frontend.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://nightly.decidim.org/ and log in as administrator.
2. Enter the admin panel and navigate to a process that have a proposals component with comments enabled.
3. Block comments in that component in the steps settings.
4. Navigate to a proposal on the frontend where comments have been blocked.
5. See that no comments can be submitted but the warning message indicating that comments have been disabled is missing.

Expected behavior
Participants should see a clear message above the comments section, indicating that comments have been disabled.

Screenshots
See enabled setting for the proposals component:

Extra data (please complete the following information):

• Device: Desktop
• Device OS: Ubuntu 22.04
• Browser: Chrome
• Decidim Version: 0.29.0.dev
• Decidim installation: Nightly

Additional context
This bug could be a regression, as the warning message used to be displayed in previous versions.