Disable scheduled run of providers integration tests (#1492)

Since we have deprecated astronomer-providers in 1.19.0,
it would make sense to disable the scheduled workflow for
running the integration tests on the providers deployment.
We can re-enable it if we need to run the integration tests
on the providers deployment again. This will help us save some
cloud costs on the resources used for running the integration
tests.

Note that we still have a workflow that triggers build and deploy
whenever new upstream OSS providers RCs are out.

.github/workflows/deploy-integration-tests.yaml

@@ -2,8 +2,12 @@
 name: Deploy integration tests to astro cloud
 
 on:  # yamllint disable-line rule:truthy
-  schedule:
-    - cron: "0 19 * * *"
+  # Since we have deprecated astronomer-providers in 1.19.0, it would make sense to disable the scheduled
+  # workflow for running the integration tests on the providers deployment. We can re-enable it if we
+  # need to run the integration tests on the providers deployment again. This will help us save some
+  # cloud costs on the resources used for running the integration tests.
+  # schedule:
+  #   - cron: "0 19 * * *"
   workflow_dispatch:
     inputs:
       git_rev: