"Joined Date" shows incorrect date when accounts are in not 3.4.0rc1 server

[rinsuki]

Expected behaviour

If accounts are hosted in server that not supporting joined date federation, we should hide "Joined Date" from Web UI.

in API, I think we should split created_at and joined_at. If account is local user, joined_at simple returns created_at. if account is remote user, set "Date that server first knows this account" to created_at, and if accounts are hosted in server that supporting joined date federation, set "Joined Date" to joined_at (if not supported, set null to joined_at).

Actual behaviour

If accounts are hosted in server that not supporting joined date federation, Web UI displaying "Date that server first knows this account" (old created_at) as "Joined Date".

Steps to reproduce the problem

1. Create New Mastodon Server (in 3.4.0rc1 or later)
2. Input any URL of accounts (that are hosted in server that not supporting joined date federation) to Search Box
3. Open Profile

Specifications

• Mastodon 3.4.0rc1