Service Template to Instance Integration mockups and flow

List below is from our call:

https://docs.google.com/document/d/1Wv1QklNdl-iHo3M4la4W61b0jb8COm_P3hsSHT72AyI/edit

Todos

• Create wireframes/mockups of entire workflow [prototype]
  • Instance-level integration list page [WIP:prototype]
  • Instance-level integration config page [WIP:prototype]
  • Service template config page [WIP:prototype]
• Write blog post that explains how Service Templates -> Integrations [TBD]
• Add instance level integrations as separate feature
• Engineering: Implement Instance-Level Integration Alongside Service Templates
  • Re-add “template” column, copy over “instance” values, and set to nil [#204801 (closed)]
  • Frontend implementation [#196525 (closed)]
  • Backend implementation [#199388 (closed)]
  • API considerations
  • Usage ping data considerations
  • Consider setting a feature flag to work on frontend and backend independently
• Add banner to service templates notifying user of new feature and future deprecation [#204785 (closed)]
  • Link to a blog post explaining the change
• Add Telemetry for Enabled Instance-Level Integrations [#204802 (closed)]
• Add feature to migrate an existing service template to an instance integration [#204804 (closed)]
  • NOTE: Customers have tooling that use the API and checks integration settings on a daily basis
• Add banner notifying instance integration of existing service template that would override [#204807 (closed)]
• Add feature displaying projects overriding settings to instance integrations [#204805 (closed)]