Assume role for PR Helper task

Author: prestonvasquez

.evergreen/config.yml

@@ -650,6 +650,7 @@ tasks:
   - name: pull-request-helpers
     allowed_requesters: ["patch", "github_pr"]
     commands:
+      - func: assume-test-secrets-ec2-role
       - func: "add PR reviewer"  
       - func: "add PR labels"
       - func: "create-api-report"
@@ -1687,7 +1688,6 @@ tasks:
             TEST_LAMBDA_DIRECTORY: ${PROJECT_DIRECTORY}/internal/cmd/faas/awslambda
             LAMBDA_STACK_NAME: dbx-go-lambda
             AWS_REGION: us-east-1
-          include_expansions_in_env: ["AWS_ACCESS_KEY_ID", "AWS_SECRET_ACCESS_KEY", "AWS_SESSION_TOKEN"]
           args: [*task-runner, evg-test-deployed-lambda-aws]
 
   - name: "oidc-auth-test"