Remove unused workflow variables

These were artifacts left over from when the test workflow also generated the tester builds, but that process been moved
to a dedicated workflow.

Author: per1234

.github/workflows/check-code-generation-task.yml

@@ -18,9 +18,6 @@ on:
       - "**/*.go"
       - "etc/schemas/**/*.json"
 
-env:
-  BUILDS_ARTIFACT: build-artifacts
-
 jobs:
   test-go:
     runs-on: ubuntu-latest

.github/workflows/test-go-task.yml

@@ -18,9 +18,6 @@ on:
       - "**/*.go"
       - "**/testdata/**"
 
-env:
-  BUILDS_ARTIFACT: build-artifacts
-
 jobs:
   test-go:
     strategy: