Bug 1713006 - Run telemetry integration tests with Python 3, r=chutten

Depends on D116043

Differential Revision: https://phabricator.services.mozilla.com/D116044

taskcluster/ci/source-test/python.yml

@@ -493,7 +493,7 @@ telemetry-integration-tests:
             source /builds/worker/scripts/xvfb.sh &&
             start_xvfb '1600x1200x24' 0 &&
             export GECKO_BINARY_PATH=$MOZ_FETCHES_DIR/firefox/firefox &&
-            python2 ./mach python-test --subsuite telemetry-integration-tests
+            ./mach python-test --subsuite telemetry-integration-tests
     fetches:
         build:
             - target.tar.bz2

toolkit/components/telemetry/tests/integration/tests/python.ini

@@ -1,6 +1,5 @@
 [DEFAULT]
 subsuite = telemetry-integration-tests
-skip-if = python == 3
 
 [test_deletion_request_ping.py]
 [test_event_ping.py]