related to #10441, inspired by the prior work done in
https://github.com/kolide/fleet/pull/1360, this PR:
1. Adds a migration to use `utf8mb4_general_ci` as the default collation
for the database and all the tables. From [MySQL's documentation][1]:
> To change the table default character set and all character columns
> (CHAR, VARCHAR, TEXT) to a new character set, use a statement like
> this:
>
> ```
> ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name;
> ```
> The statement also changes the collation of all character columns. If
> you specify no COLLATE clause to indicate which collation to use, the
> statement uses default collation for the character set.
2. Changes the connection settings to use `utf8mb4_general_ci` as the
default collation, from the [driver docs][2]:
> Sets the collation used for client-server interaction on
connection. In contrast to charset, collation does not issue additional
queries. If the specified collation is unavailable on the target server,
the connection will fail.
[1]: https://dev.mysql.com/doc/refman/5.7/en/alter-table.html
[2]: https://github.com/go-sql-driver/mysql
**TODO:** discuss how we can enforce this, is setting the database
default collation enough? should we add some kind of custom lint rule to
all migrations?
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality
Roberto Dip
305392e7bb