Add Bugzilla instance integration
What does this MR do and why?
This MR:
- Adds instance version of Bugzilla integration
- Refactors existing Bugzilla integration and extracts shared functionality into a separate concern
The new instance version of Bugzilla integration is not used yet and will be used in the future MR. For now, we add the new integration in order to support integrations in Cells architecture we need to split existing integrations into group/project integrations (existing integrations table) and instance wide integrations.
Mentions #474809 (closed)
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