Add custom fields to tickets

Coung Ngorequested to merge
580397-cngo-add-custom-fields-to-tickets into master

What does this MR do and why?

Add custom fields to tickets (#580397 (closed))

This continues the work to fully convert Tickets to work items

Behind feature flag work_item_ticket_migration, which this MR creates

References

Screenshots or screen recordings

Before After

How to set up and validate locally

  1. Enable the work_item_ticket_migration feature flag
  2. Go to a group, go to the settings > work items
  3. Create a new custom field for the Ticket type
  4. Confirm you can view and modify the custom field when viewing the Ticket in the work item view

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #580397 (closed)

Edited by Coung Ngo

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