Refactors implementation to remove unneeded submodules and modernize syntax

[lorengordon]

No description provided.

[lorengordon]

Results of make test:

❯ make terraform/pytest PYTEST_ARGS="-v --nomock"
[bootstrap]: Using external tardigrade-ci, skipping auto-init
[pytest//home/x/git/repos/tardigrade-ci/tests/terraform_pytest] Starting Python tests found under the directory "/home/x/git/repos/tardigrade-ci/tests/terraform_pytest"
pytest /home/x/git/repos/tardigrade-ci/tests/terraform_pytest -v --nomock
=============== test session starts ================
platform linux -- Python 3.8.18, pytest-8.2.2, pluggy-1.5.0 -- /home/x/.pyenv/versions/3.8.18/bin/python3.8
cachedir: .pytest_cache
rootdir: /home/x/git/repos
collected 2 items

../tardigrade-ci/tests/terraform_pytest/test_terraform_install.py::test_modules[test-same-account] PASSED                                                                                                          [ 50%]
../tardigrade-ci/tests/terraform_pytest/test_terraform_install.py::test_modules[test-cross-account] PASSED                                                                                                         [100%]

========== 2 passed in 156.30s (0:02:36) ===========
[pytest//home/x/git/repos/tardigrade-ci/tests/terraform_pytest]: Tests executed!