Remove resultdb.resultsUploader role.
Remove resultdb.resultsUploader role.

This role is not necessary as this is controlled per-invocation via an
update token given to the invocation creator, who then makes it
available to the results uploader.

R=chanli,vadimsh

Change-Id: Ia1b9163f26080b695fc705b0db751dbe455d5fca
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2230784
Reviewed-by: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>
Reviewed-by: Chan Li <332b6c56634d0f63001046c664a2370006a02420@chromium.org>
Commit-Queue: Roberto Carrillo <b31161e510fbb37f8f70fdcde11530d2bae88470@chromium.org>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py