Disable scheduled run of providers integration tests

[pankajkoti]

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.33%. Comparing base (4294a8b) to head (aca75e2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1492   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files          94       94           
  Lines        4635     4635           
=======================================
  Hits         4558     4558           
  Misses         77       77           

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