Remove pyproject-rpm-macros mock-based tests that cannot be executed on c9s

Related: rhbz#1950291

tests/tests.yml

@@ -1,26 +0,0 @@
----
-- hosts: localhost
-  roles:
-  - role: standard-test-basic
-    tags:
-    - classic
-    repositories:
-    - repo: "https://src.fedoraproject.org/rpms/pyproject-rpm-macros.git"
-      dest: "pyproject-rpm-macros"
-    tests:
-    - pyproject_pytest:
-        dir: pyproject-rpm-macros/tests
-        run: ./mocktest.sh python-pytest
-    - pyproject_entrypoints:
-        dir: pyproject-rpm-macros/tests
-        run: ./mocktest.sh python-entrypoints
-    - pyproject_pluggy:
-        dir: pyproject-rpm-macros/tests
-        run: ./mocktest.sh python-pluggy
-    - pyproject_clikit:
-        dir: pyproject-rpm-macros/tests
-        run: ./mocktest.sh python-clikit
-    required_packages:
-    - mock
-    - rpmdevtools
-    - rpm-build