Testing: Remove ZONE environment variable, long live ZONES #1274
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Description
PR #1224 added support for ZONES, and a changelist in google3 with description "Use new ZONES variable to spread load across zones/regions." switched the last caller to use it instead of ZONE. There is still a test using its own environment variable called ZONE, but not relying on gce_testing.go to use it.
Related issue
b/280064697
How has this been tested?
automated tests
Checklist: