Bug 1843026 - Use taskcluster-built python for condprof task r=glandium,taskgraph-reviewers,ahal

Re applied now that taskcluster-built python works on OSX.

Differential Revision: https://phabricator.services.mozilla.com/D183367

taskcluster/ci/condprof/kind.yml

@@ -29,6 +29,7 @@ job-defaults:
     worker:
         taskcluster-proxy: true
         max-run-time: 10800
+    use-system-python: false
 jobs:
     windows2012-64-firefox:
         worker-type: b-win2022
@@ -87,8 +88,8 @@ jobs:
                 - linux64-geckodriver
         run:
             command: >-
-                python3.7 -m venv . &&
-                bin/python3.7 condprof/main.py
+                python3 -m venv . &&
+                bin/python3 condprof/main.py
                 ${EXTRA_ARGS}
                 --geckodriver ${MOZ_FETCHES_DIR}/geckodriver
                 --firefox ${MOZ_FETCHES_DIR}/firefox/firefox-bin

taskcluster/gecko_taskgraph/transforms/condprof.py

@@ -28,6 +28,7 @@ diff_description_schema = Schema(
         Optional("run-on-projects"): task_description_schema["run-on-projects"],
         Optional("scopes"): task_description_schema["scopes"],
         Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("use-system-python"): bool,
         Optional("worker"): job_description_schema["worker"],
         Optional("worker-type"): task_description_schema["worker-type"],
     }
@@ -82,4 +83,9 @@ def generate_scenarios(config, tasks):
                 "dependencies": copy_task(task["dependencies"]),
                 "fetches": copy_task(task["fetches"]),
             }
+
+            use_system_python = task.get("use-system-python", None)
+            if use_system_python is not None:
+                taskdesc["use-system-python"] = use_system_python
+
             yield taskdesc