Update signup_enabled metric definition

  - Update group, section, stage, category
  - Update tier, distribution
  - Generate Dictionary

config/metrics/settings/20210204124918_signup_enabled.yml

 ---
 key_path: signup_enabled
 description: Whether public signup is enabled
-product_section: growth
-product_stage: growth
-product_group: group::product intelligence
-product_category: collection
+product_section: dev
+product_stage: manage
+product_group: group::access
+product_category: authentication_and_authorization
 value_type: boolean
 status: data_available
 time_frame: none
-data_source:
+data_source: database
 distribution:
 - ce
+- ee
 tier:
 - free
+- premium
+- ultimate
 skip_validation: true

doc/development/usage_ping/dictionary.md

@@ -13322,11 +13322,11 @@ Whether public signup is enabled
 
 [YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/config/metrics/settings/20210204124918_signup_enabled.yml)
 
-Group: `group::product intelligence`
+Group: `group::access`
 
 Status: `data_available`
 
-Tiers: `free`
+Tiers: `free`, `premium`, `ultimate`
 
 ### `topology.duration_s`