[openstreetmap/openstreetmap-website] blocks with needs_view flag not shown when user does oauth authorisation (for example login into an OSM editor) (Issue #5490)

[Mateusz Konieczny]

### Problem

user doing oauth authorisation (for example login into an OSM editor) which is blocked will not be notified by osm.org about a block

### Description

This was tested on Android, as part of https://github.com/streetcomplete/StreetComplete/issues/6062 resulting from https://community.openstreetmap.org/t/is-this-the-same-person/123461

I spend noticeable amount of time on this and I am still a bit confused.

Following seems to reproduce it:

1) Login in a browser, remember login, close browser
2) Become blocked, with 0-hour block that must be seen before 
3) Grant oauth token in the same browser (logging into some editor software using that generated token)

Expected: block message is shown on user entering the site, as from user perspective they log into some software

Actual: oauth authorisation appears, control handed to requesting software, user still blocked. 

I am aware that there are some ugly workarounds that can be done by app, and done by some editing software.

### Screenshots

_No response_

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