Merge branch 'mj/remove-geo-mysql' into 'master'

Remove geo mysql database config example

See merge request gitlab-org/gitlab-ee!14549

config/database_geo.yml.mysql

-# Warning: We don't support MySQL replication for GitLab Geo,
-# this file is needed to run tests on GitLab CI.
-
-#
-# PRODUCTION
-#
-production:
-  adapter: mysql2
-  encoding: utf8
-  collation: utf8_general_ci
-  reconnect: false
-  database: gitlabhq_geo_production
-  pool: 10
-  username: git
-  password: "secure password"
-  host: localhost
-  # socket: /tmp/mysql.sock
-
-#
-# Development specific
-#
-development:
-  adapter: mysql2
-  encoding: utf8
-  collation: utf8_general_ci
-  reconnect: false
-  database: gitlabhq_geo_development
-  pool: 5
-  username: root
-  password: "secure password"
-  host: localhost
-  # socket: /tmp/mysql.sock
-
-#
-# Staging specific
-#
-staging:
-  adapter: mysql2
-  encoding: utf8
-  collation: utf8_general_ci
-  reconnect: false
-  database: gitlabhq_geo_staging
-  pool: 10
-  username: git
-  password: "secure password"
-  host: localhost
-  # socket: /tmp/mysql.sock
-
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
-test: &test
-  adapter: mysql2
-  encoding: utf8mb4
-  collation: utf8mb4_general_ci
-  reconnect: false
-  database: gitlabhq_geo_test
-  pool: 5
-  username: root
-  password:
-  host: localhost
-  # socket: /tmp/mysql.sock