ci: Remove responses from requirements-testing.txt (#6621)

Remove the package from `requirements-testing.txt` and add it only as a dependency of the test suites that rely on it.
Add `fastapi[test]` as a dependency for `graphene` tests, to avoid unhandled `ImportError` exceptions that arose after moving the `responses` dependency.
This is part of environment cleanup before moving the remaining testing dependencies to a uv dependency group.

Author: alexander-alderman-webb

requirements-testing.txt

@@ -3,5 +3,4 @@ pytest-cov
 dataclasses; python_version < "3.7"
 executing
 asttokens
-responses
 setuptools

scripts/populate_tox/config.py

@@ -167,6 +167,9 @@
     },
     "gql": {
         "package": "gql[all]",
+        "deps": {
+            "*": ["responses"],
+        },
         "num_versions": 2,
     },
     "google_genai": {
@@ -179,7 +182,7 @@
     "graphene": {
         "package": "graphene",
         "deps": {
-            "*": ["blinker", "fastapi", "flask", "httpx"],
+            "*": ["blinker", "fastapi[test]", "flask", "httpx"],
             "py3.6": ["aiocontextvars"],
         },
     },

scripts/populate_tox/tox.jinja

@@ -137,13 +137,15 @@ deps =
     aws_lambda: fastapi
     aws_lambda: requests
     aws_lambda: uvicorn
+    aws_lambda: pyyaml
 
     # OpenTelemetry (OTel)
     opentelemetry: opentelemetry-distro
     opentelemetry: pytest-forked
 
     # OpenTelemetry with OTLP
     otlp: opentelemetry-distro[otlp]
+    otlp: responses
 
     # OpenTelemetry Experimental (POTel)
     potel: opentelemetry-distro