Remove staging env deployment

[phanikumv]

We haven't been doing the staging deployment since a long time. Hence removing the logic accordingly.

[codecov]

Codecov Report

Base: 98.30% // Head: 98.30% // No change to project coverage 👍

Coverage data is based on head (8342e6c) compared to base (ecd5881).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #653   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          79       79           
  Lines        4131     4131           
=======================================
  Hits         4061     4061           
  Misses         70       70           

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[pankajastro]

there are a few more variables etc related to staging deployment in the script can you please remove them also
https://github.com/astronomer/astronomer-providers/blob/main/.circleci/integration-tests/script.sh#L9
https://github.com/astronomer/astronomer-providers/blob/main/.circleci/integration-tests/script.sh#L29
https://github.com/astronomer/astronomer-providers/blob/main/.circleci/integration-tests/script.sh#L56
https://github.com/astronomer/astronomer-providers/blob/main/.circleci/integration-tests/script.sh#L67