Fix: Make swagger doc compliant to OpenAPI (#3394)

This fixes issues in the swagger.json file. The motivation to do so is to be able to generate API clients using https://openapi-generator.tech Doing so will require further changes to the api spec, but this seems like a good first step since it is now "valid" according to editor.swagger.io and openapi-generator validate.

Fixes #2806

swagger/paths/platform/users/login.yml

@@ -1,21 +1,20 @@
-get:
-  tags:
-    - Users
-  operationId: get-sso-url-of-a-user
-  summary: Get User SSO Link
-  description: Get the sso link of a user
-  security:
-    - platformAppApiKey: []
-  responses:
-    200:
-      description: Success
-      schema:
-        type: object
-        properties:
-          url:
-            type: string
-            description: SSO url to autenticate the user
-    401:
-      description: Unauthorized
-    404:
-      description: The given user does not exist
+tags:
+  - Users
+operationId: get-sso-url-of-a-user
+summary: Get User SSO Link
+description: Get the sso link of a user
+security:
+  - platformAppApiKey: []
+responses:
+  200:
+    description: Success
+    schema:
+      type: object
+      properties:
+        url:
+          type: string
+          description: SSO url to autenticate the user
+  401:
+    description: Unauthorized
+  404:
+    description: The given user does not exist