This change introduces the `[oslo_messaging_notifications]` configuration section in the Heat charm, enabling Fleio integration with OpenStack by setting up the necessary notification driver. Previously, this configuration was missing, which prevented Fleio from receiving required notifications from Heat.
The following section is now included in the `heat.conf`:
```
{% include "section-oslo-notifications" %}
```
Closes-Bug: #2085784
Change-Id: I49778d60a7623ebdaea37edeba731d65a3dad15e
91aa6015c4