Remove references to relengapi-proxy

This was used for tooltool until bug 1557255 but stayed in the task
schema for some reason. This brings the docker task schema from
taskgraph closer to the one in gecko

Author: Eijebong

src/taskgraph/transforms/task.py

@@ -268,7 +268,6 @@ class DockerWorkerPayloadSchema(Schema, forbid_unknown_fields=False, kw_only=Tru
     # image or in-tree docker image to run the task in.
     docker_image: DockerImage
     # worker features that should be enabled
-    relengapi_proxy: bool
     chain_of_trust: bool
     taskcluster_proxy: bool
     allow_ptrace: bool
@@ -340,9 +339,6 @@ def build_docker_worker_payload(config, task, task_def):
 
     features = {}
 
-    if worker.get("relengapi-proxy"):
-        features["relengAPIProxy"] = True
-
     if worker.get("taskcluster-proxy"):
         features["taskclusterProxy"] = True
 
@@ -798,7 +794,6 @@ def set_defaults(config, tasks):
 
         worker = task["worker"]
         if worker["implementation"] in ("docker-worker",):
-            worker.setdefault("relengapi-proxy", False)
             worker.setdefault("chain-of-trust", False)
             worker.setdefault("taskcluster-proxy", False)
             worker.setdefault("allow-ptrace", False)