Revoke unauthorized changes to "Mojang Priority" field

[violine1101]

Purpose

When it's possible to change Mojang Priority despite not being authorized to do so, the bot should revert those changes.

Approach

Copied RevokeConfirmationModule, and changed a few things up.

The mojang priority field appears to be a bit tricky because of the "None" default that needs to be dealt with. Instead of the name of the field values, I use the IDs which is safer and also means I can revert priority back to "None".

Future work

Fix up how we interact with JIRA API, this is really janky.

Checklist

• [ ] Included tests
• [x] Updated documentation in README and docs folder
• [x] Tested in MCTEST-xxx

[violine1101]

Works for newly created bug reports too, just tested it.