fix(api): Remove regex check for autoscaling target in autogenerated files (#385)

* Remove autoscaling regex pattern from openapi specs

* Update autogenerated go middleware files

* Update autogenerated python sdk files

* Update autoscaling policy target validation tag

* Update validator test

Author: deadlycoconuts

api/api/openapi.bundle.yaml

@@ -2349,7 +2349,6 @@ components:
           - rps
           type: string
         target:
-          pattern: ^\d+$
           type: string
       type: object
     Protocol:

api/api/specs/routers.yaml

@@ -969,7 +969,6 @@ components:
             - "rps"
         target:
           type: "string"
-          pattern: '^\d+$'
 
     BigQueryConfig:
       type: "object"