fix(spp_dci_client): show bearer token field in data source form

The data source model enforces a constraint requiring bearer_token when
auth_type is 'bearer', but the form view only rendered the OAuth2 fields.
Selecting 'Bearer Token' left no input to set the credential. Add the
bearer_token field gated on auth_type == 'bearer', mirroring the OAuth2
field layout.

Author: gonzalesedwin1123

spp_dci_client/views/data_source_views.xml

@@ -120,6 +120,12 @@
                                 name="auth_type"
                                 help="Authentication method to use with this data source"
                             />
+                            <field
+                                name="bearer_token"
+                                widget="password"
+                                invisible="auth_type != 'bearer'"
+                                help="Static Bearer token sent as the Authorization header"
+                            />
                             <field
                                 name="oauth2_token_url"
                                 widget="url"