chore: remove usage of vars.MONGODB_ATLAS_ENABLE_BETA (#2024)

Author: EspenAlbert

.github/workflows/acceptance-tests-runner.yml

@@ -310,7 +310,7 @@ jobs:
           terraform_wrapper: false  
       - name: Acceptance Tests
         env:
-          MONGODB_ATLAS_ENABLE_PREVIEW: ${{ vars.MONGODB_ATLAS_ENABLE_PREVIEW }}
+          MONGODB_ATLAS_ENABLE_PREVIEW: "true"
           TEST_REGEX: "^TestAccStream"
         run: make testacc
 

.github/workflows/examples.yml

@@ -13,7 +13,7 @@ on:
 
 env:
   AWS_DEFAULT_REGION: us-west-2
-  MONGODB_ATLAS_ENABLE_PREVIEW: ${{ vars.MONGODB_ATLAS_ENABLE_PREVIEW }}
+  MONGODB_ATLAS_ENABLE_PREVIEW: "true"
 
 jobs:
   tf-validate: