Ian Wienand 7187b313d8 Remove /tarballs proxy from mirrors
As described in the dependent change, which removes the environment
var to set this up, this is no longer required.

Story: #2006598
Task: #39014

Change-Id: I93455dd1512aeb9111feaf516abfb60695976663
Depends-On: https://review.opendev.org/714543
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