Restore all providers and use schedule trigger for e2e tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: are-ces

.github/workflows/e2e_tests_providers.yaml

@@ -2,7 +2,9 @@
 name: E2E Inference Provider Tests
 
 on: 
-  push
+  schedule:
+    - cron: "0 0 * * *"  # Runs once a day at midnight UTC
+  workflow_dispatch:
 
 jobs:
   e2e_tests:
@@ -11,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         mode: ["server", "library"]
-        environment: ["bedrock"]
+        environment: ["azure", "vertexai", "watsonx", "bedrock"]
 
     name: "E2E: ${{ matrix.mode }} mode / ${{ matrix.environment }}"