Surface batch change reviewer in dashboard

Created by: malomarrec

Problem to solve

A lot of customers don't use codehost notifications. To get changesets merged, the batch changes owner need to identify the changeset reviewers to follow up with. Besides, some customers want multiple reviewers per changeset.

-> Who, and how many reviewers reviewed my changeset?

Solution summary

Assuming customers have a way to auto-assign reviewers to changesets (eg. with CODEOWNERS), we could make following up with customers easier by showing the reviewer directly in the dashboard. That'd allow customers to:

• quickly view who owns reviewing a changeset
• pull the list of reviewers with changesets that need review

Impacted customers

• https://github.com/sourcegraph/accounts/issues/244 (product gap: https://sourcegraph2020.lightning.force.com/lightning/r/Product_Gap_Submission__c/a1C5b00000AFN5pEAH/view)

Delivery plan

• evaluate if codehosts API support getting reviewers
• get additional feedback on this solution