[native] update Tunnelbroker init message to rely on Identity userID

Summary:
To authenticate we need to use ID assigned by identity.
I added accessToken as a dependency to fetch new Services Metadata each time CSAT changes (it should be caused by the event emitter that @marcin is implementing) so I think this should be safe and avoid any race conditions.

Note: This code is used for testing anyway and will change after making logging to Identity mandatory,

Depends on D10327

Test Plan:

1. Login to staging Identity (loginPasswordUser).
2. Call setCommServicesAuthMetadata.
3. Dispatch action with the new access token.
4. Check if the connection with staging Tunnelbroker was created.

Reviewers: marcin, varun, michal

Reviewed By: marcin

Subscribers: ashoat, tomek, marcin

Differential Revision: https://phab.comm.dev/D10370