Use Objectstore auth token instead of Sentry auth token

[lcian]

Description

Change the implementation for the snapshots subcommand to use the Objectstore auth token instead of the Sentry auth token.
Prerequisites:

1. Remove Django auth from Objectstore endpoint
2. Mount secrets, access them from Sentry to mint JWTs, modify snapshots upload-options endpoint to provide JWT to sentry-cli
3. Change sentry-cli to receive the token and use it for auth, as opposed to the Sentry auth token

[linear]

CLI-292