Test v2/auth/bearer in REST #1281
Description
Is your feature request related to a problem? Please describe.
I'm always frustrated when we don't have tests for new REST gateway features.
Describe the solution you'd like
0.16.0 reworked bearer token support somewhat. We have a new v2/auth/bearer and associated NeoFS-Bearer-Token header. It can be used independently of session tokens or in conjunction with them. All modes need to be tested.
Additional context
https://github.com/nspcc-dev/neofs-rest-gw/releases/tag/v0.16.0