rm tags we now set during upload

see JuliaCI/julia-buildkite#435

Author: IanButterworth

test/buildkitetestjson.jl

@@ -65,9 +65,6 @@ function result_dict(testset::Test.DefaultTestSet, prefix::String="")
         "id" => Base.UUID(rand(UInt128)),
         "scope" => scope,
         "tags" => Dict{String,String}(
-            "job_label" => get(ENV, "BUILDKITE_LABEL", "unknown"),
-            "job_id" => get(ENV, "BUILDKITE_JOB_ID", "unknown"),
-            "job_group" => get(ENV, "BUILDKITE_GROUP_LABEL", "unknown"),
             "os" => string(Sys.KERNEL),
             "arch" => string(Sys.ARCH),
             "julia_version" => string(VERSION),