Revert "Updating testing-and-coverage to look for and include requirements.txt when running test-lowest-version."

This reverts commit a94a3fe.

Author: drewoldag

python-project-template/.github/workflows/testing-and-coverage.yml.jinja

@@ -53,16 +53,9 @@ jobs:
         uv venv venv
         source venv/bin/activate
         {%- if test_lowest_version == 'direct' %}
-        if [ -f requirements.txt ]; then
-          uv pip compile --resolution=lowest-direct -o requirements_lowest.txt pyproject.toml --build-constraints=requirements.txt
-        else
-          uv pip compile --resolution=lowest-direct -o requirements_lowest.txt pyproject.toml
+        uv pip compile --resolution=lowest-direct -o requirements_lowest.txt pyproject.toml
         {%- elif test_lowest_version == 'all' %}
-        if [ -f requirements.txt ]; then
-          uv pip compile --resolution=lowest -o requirements_lowest.txt pyproject.toml --build-constraints=requirements.txt
-        else
-            uv pip compile --resolution=lowest -o requirements_lowest.txt pyproject.toml
-        fi
+        uv pip compile --resolution=lowest -o requirements_lowest.txt pyproject.toml
         {%- endif %}
         uv pip install --constraint=requirements_lowest.txt -e .[dev]
     - name: Run unit tests with pytest