deployment::server: move releases::upload into role

Letting releasers upload releases to caesium should be a feature
of a deployment server in general.

It should work from either of the main DCs.

This will remove it from tin but add it to the role which is applied on
tin and mira, effectively making it work on mira in codfw.

Change-Id: Ica21c2a4cc0c57e12b083e6ae184d8dd8055ac6c