feat: allow editors to summarise operations in "History" timeline

[jessicamcinchak]

A small indepedent feature that we need to support both templates and publishing tickets in this SOW (similar to flows being published & offline by default) is the ability for editors to insert "comments" into the current "History" timeline.

The "History" timeline currently reads from operations and displays a human translation of the JSON OT. Operations will remain the only timeline items that can be "restored", but the "comments" will allow editors to insert notes which essentially act like subheaders on the timeline between groups of operations to contextualise the bigger picture (eg "Implemented new CIL Form 1") between publishes (which may still include 1,000s of individual node operations).

These will enable us to show more friendly change logs on publish as well as help templated flow users understand how the source template content has been changing.

It's in our interest to introduce this feature early, not under the "TEMPLATES" feature flag, so that editors can actually start using it in the meantime even though we are not adjusting the "Check for changes to publish" dialog just yet.

Todo:

• Create new table & fkey relationships flow_change_logs
• Add basic UI for teamEditors to insert comments about their flows
• Display comments in current "History" timeline alongside operations
  • Add a second subscription and simply concat+sort responses? Make a new view to subscribe to in single go or try the _stream query option in Hasura? (If a view-based approach, should we join published flows too?)

[github-actions]

🤖 Hasura Change Summary compared a subset of table metadata including permissions:

Tracked Tables (1)

• public.flow_change_logs permissions:

  	insert	select	update	delete
  demoUser	➕	➕
  platformAdmin	➕	➕
  teamEditor	➕	➕

  24 added column permissions

  	insert	select	update
  demoUser	➕ actor_id ➕ comment ➕ flow_id	➕ actor_id ➕ comment ➕ created_at ➕ flow_id ➕ id
  platformAdmin
  teamEditor

Updated Tables (1)

• public.flows

[jessicamcinchak]

Add ability to insert comment into "History" timeline that can be pulled through in publish changelogs