Batch Changes on Bitbucket cloud

Created by: sourcegraph-bot

Support Bitbucket Cloud.

Context Bitbucket server deprecated 2022. LTS until 2024

Product gap

https://sourcegraph2020.lightning.force.com/lightning/r/Product_Gap__c/a1B3t00000IkxMjEAJ/view

Implementation plan

• Set up a test workspace with super and regular users
• #32718
• Work out which permissions are required when creating an app password.
  • They are: account:read, repo:read, repo:write, pr:write, pipeline:read (and the associated permissions that are implicitly enabled by these permissions)
• Figure out what our options are for pushing branches — SSH vs HTTPS, and how authenticators will play into that.
• #33944
• #33946
• #33949
• sourcegraph/src-cli#725
• Figure out rate limiting, since our current implementation is pretty rough. (Ryan did this in #33773)
• #34554
• Docs
• In-app changelog
• Demo

Useful links

• Bitbucket Cloud REST API
• Test workspace for Batch Changes

Impacted customers

• https://github.com/sourcegraph/accounts/issues/6231
• https://github.com/sourcegraph/accounts/issues/8016
• https://github.com/sourcegraph/accounts/issues/250