Raise error if unsupported charset for mysql

`blog$ bin/rails db:create`

Before:
```
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf42", "pool"=>5,
"username"=>"root", "password"=>nil, "socket"=>"/var/run/mysqld/mysqld.sock",
"database"=>"blog_development"}, {:charset=>"utf42"}
(If you set the charset manually, make sure you have a matching collation)
Created database 'blog_development'
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf42", "pool"=>5,
"username"=>"root", "password"=>nil, "socket"=>"/var/run/mysqld/mysqld.sock",
"database"=>"blog_test"}, {:charset=>"utf42"}
(If you set the charset manually, make sure you have a matching collation)
Created database 'blog_test'
```

After:
```
Unsupported charset: '"utf42"'
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf42", "pool"=>5,
"username"=>"root", "password"=>nil, "socket"=>"/var/run/mysqld/mysqld.sock",
"database"=>"blog_development"}
rails aborted!
Mysql2::Error: Unsupported charset: '"utf42"'
...
(stack trace)
...
bin/rails:4:in `<main>'
Tasks: TOP => db:create
(See full trace by running task with --trace)
```

Closes #29683
Related to #27398

0 files changed, 0 insertions, 0 deletions