Deleting deployment library, tests and target for the tests (#2410)

Summary:
Pull Request resolved: #2410

# Context

This diff stack aims to delete the deployment library which was initially developed to delete the deployment shell scripts with python scripts for better code coverage.

This diff deletes the deployment library, tests and target for the tests in the fbpcs repository. The code changes in each file of the diff are as follows:

- fbcode/fbpcs/TARGETS: The python_unittest target for the test_pce_deployment_library is removed.
- fbcode/fbpcs/infra/pce_deployment_library/test/test_terraform_deployment.py: This file is deleted.
- fbcode/fbpcs/infra/pce_deployment_library/test/test_aws.py: This file is deleted.
- fbcode/fbpcs/infra/pce_deployment_library/publisher_pce/publisher_pce_utils.py: This file is deleted.
- fbcode/fbpcs/infra/pce_deployment_library/publisher_pce/deploy.py: This file is deleted.

Reviewed By: ajaybhargavb

Differential Revision: D59231591

fbshipit-source-id: 6b49a156c5d2f020322ca480195126b802229207