Adding support for the Scaleway SCW_PROFILE environment variable. (#11311)

* Adding support for the Scaleway SCW_PROFILE environment variable.

* Adding changelog fragment.

* Adding documentation for the environment variable.

* Adding SCW_PROFILE as a proper environment variable via the DOCUMENTATION block.

* Updating changelog fragment.

plugins/inventory/scaleway.py

@@ -45,6 +45,9 @@ options:
         not defined.
     type: string
     version_added: 4.4.0
+    env:
+      - name: SCW_PROFILE
+        version_added: 12.2.0
   oauth_token:
     description:
       - Scaleway OAuth token.