Move all account link / unlink to new registration flow
Summary:
Ref T1536. Currently, we have separate panels for each link/unlink and separate controllers for OAuth vs LDAP.
Instead, provide a single "External Accounts" panel which shows all linked accounts and allows you to link/unlink more easily.
Move link/unlink over to a full externalaccount-based workflow.
Test Plan:
- Linked and unlinked OAuth accounts.
- Linked and unlinked LDAP accounts.
- Registered new accounts.
- Exercised most/all of the error cases.
Reviewers: btrahan, chad
Reviewed By: btrahan
CC: aran, mbishopim3
Maniphest Tasks: T1536
Differential Revision: https://secure.phabricator.com/D6189