Update bugzilla code to support utf8 collation

[kaihendry]

Issues that are plaguing like like:

• emoji triggering an internal server error
• slow database performance due to recalculating indexes

Are because though we manually updated our schema to utf8mb4 / utf8mb4_unicode_520_ci. Bugzilla stable release which we rely on, hasn't updated its connection parameters and code to support the schema.

Fixing this

There are a couple of paths forward:

Either we somehow update Bugzilla stable's Perl codebase to support Unicode schema ourselves. Or we adopt the new version of Bugzilla called Harmony that supports Unicode.

Migrating to Harmony sounds attractive, but it appears to introduce a lot of complexity that we already have encapsulated in our Meteor Frontend project. Furthermore Harmony doesn't appear nearly as stable as Bugzilla 5.0.6.

• https://media.dev.unee-t.com/2019-06-27/bugzilla-stable.sql
• https://media.dev.unee-t.com/2019-06-27/harmony.sql

Both options depend on @dylanwh's expertise and hopefully he will weigh in with a proposal over the weekend. This issue is just to document the situation we have.

[kaihendry]

The https://github.com/bugzilla/bugzilla/tree/synthesis branch is addressing this and under test now and will probably be merged into our Bugzilla docker image.

[kaihendry]

This is underway https://github.com/unee-t/frontend/issues/850#issuecomment-518118111