Validate if `utf8mb4` character set and longer index key prefix is supported
Once #33608 merged If users create a new database using MySQL 5.1.x, it will fail to create databases since MySQL 5.1 does not know `utf8mb4` character set. This pull request removes `encoding: utf8mb4` from `mysql.yml.tt` to let create_database method handles default character set by MySQL server version. `supports_longer_index_key_prefix?` method will need to validate if MySQL 5.5 and 5.6 server configured correctly to support longer index key prefix, but not yet.
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