Requirements files should be a key in the kind.yml, and they should be installed with a transform

[gregtatum]

This will help with our local testing config, and simplify our kind.yml files.

Something like:

diff --git a/taskcluster/kinds/evaluate-teacher-ensemble/kind.yml b/taskcluster/kinds/evaluate-teacher-ensemble/kind.yml
index cb945c5..0bace02 100644
--- a/taskcluster/kinds/evaluate-teacher-ensemble/kind.yml
+++ b/taskcluster/kinds/evaluate-teacher-ensemble/kind.yml
@@ -22,6 +22,7 @@ kind-dependencies:
 tasks:
     "{provider}-{dataset}-{src_locale}-{trg_locale}":
         description: teacher evaluation for {dataset} {src_locale}-{trg_locale}
+        python-requirements: $VCS_PATH/pipeline/eval/requirements/eval.txt
         attributes:
             stage: evaluate-teacher-ensemble
             dataset-category: test