add expectations that environment tags are not collected when running…

… multiple examples

spec/datadog/ci/contrib/cucumber/instrumentation_spec.rb

@@ -36,6 +36,8 @@ def do_execute
     end
 
     it "creates spans for each scenario and step" do
+      expect(Datadog::CI::Ext::Environment).to receive(:tags).never
+
       expect(kernel).to receive(:exit).with(0)
 
       do_execute

spec/datadog/ci/contrib/minitest/instrumentation_spec.rb

@@ -43,6 +43,8 @@ def test_foo
   end
 
   it "creates spans for several tests" do
+    expect(Datadog::CI::Ext::Environment).to receive(:tags).never
+
     num_tests = 20
 
     klass = Class.new(Minitest::Test) do

spec/datadog/ci/contrib/rspec/instrumentation_spec.rb

@@ -56,6 +56,8 @@ def with_new_rspec_environment
   end
 
   it "creates spans for several examples" do
+    expect(Datadog::CI::Ext::Environment).to receive(:tags).never
+
     num_examples = 20
     with_new_rspec_environment do
       RSpec.describe "many tests" do