fix: unassign primary ip and floating ip before deletion (#796)

##### SUMMARY

Explicitly unassign Primary IP and Floating IPs before deleting them.
This allows us to better handle any errors that happen during the
unassign and is consistent with the flow in our Terraform provider.

##### ISSUE TYPE

- Bugfix Pull Request

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below
-->

- `floating_ip`
- `primary_ip`

---------

Co-authored-by: jo <ljonas@riseup.net>

plugins/modules/floating_ip.py

@@ -281,16 +281,24 @@ class AnsibleFloatingIP(AnsibleHCloud):
                 self.floating_ip = self.floating_ip.update(**params)
 
     def _delete(self):
-        if self.module.params.get("force") or self.floating_ip.server is None:
+        if self.floating_ip.server is not None:
+            if self.module.params.get("force"):
+                if not self.module.check_mode:
+                    action = self.floating_ip.unassign()
+                    action.wait_until_finished()
+
+                    self.floating_ip.delete()
+                self._mark_as_changed()
+            else:
+                self.module.warn(
+                    "Floating IP is currently assigned to server "
+                    f"{self.floating_ip.server.name}. You need to "
+                    "unassign the Floating IP or use force=true."
+                )
+        else:
             if not self.module.check_mode:
                 self.floating_ip.delete()
             self._mark_as_changed()
-        else:
-            self.module.warn(
-                "Floating IP is currently assigned to server "
-                f"{self.floating_ip.server.name}. You need to "
-                "unassign the Floating IP or use force=true."
-            )
 
         self.floating_ip = None