Revert "gnu: Add python-pytest-enabler."

This reverts commit 0a8c46e89f.

An older version of python-pytest-enabler already exists in (gnu packages
check).

gnu/packages/python-check.scm

@@ -2115,62 +2115,6 @@ (define-public python-allpairspy
 most situations.")
     (license license:expat)))
 
-(define-public python-pytest-enabler
-  (package
-    (name "python-pytest-enabler")
-    (version "2.1.0")
-    (source (origin
-              (method url-fetch)
-              (uri (pypi-uri "pytest-enabler" version))
-              (sha256
-               (base32
-                "0m7m19829jwj1wqss73m8q1lpmkqhzkqp1xm4ahq0d7kjjghd4cb"))))
-    (build-system pyproject-build-system)
-    (arguments
-     (list
-      #:test-flags
-      '(list "--ignore=_custom_build/backend.py"
-             "-k" "not mypy-status")
-      #:phases
-      '(modify-phases %standard-phases
-         ;; The build system insists on ignoring the existing environment and
-         ;; running "pip install".
-         (add-after 'unpack 'do-not-use-pip-install
-           (lambda _
-             (substitute* "pyproject.toml"
-               (("^build-backend.*") "\
-build-backend = \"backend\"
-backend_path = [\"_custom_build\"]\n")
-               (("requires = .*") "requires = []\n"))
-             (mkdir-p "_custom_build")
-             (with-output-to-file "_custom_build/backend.py"
-               (lambda _
-                 (display "\
-from setuptools import build_meta as _orig
-from setuptools.build_meta import *
-def get_requires_for_build_wheel(config_settings=None):
-    return []
-def get_requires_for_build_sdist(config_settings=None):
-    return []
-")))
-             (setenv "PYTHONPATH"
-                     (string-append (getcwd) "/_custom_build")))))))
-    (propagated-inputs (list python-jaraco-context python-jaraco-functools
-                             python-toml))
-    (native-inputs (list python-flake8
-                         python-pytest
-                         python-pytest-black
-                         python-pytest-checkdocs
-                         python-pytest-cov
-                         python-pytest-flake8
-                         python-pytest-mypy
-                         python-types-toml))
-    (home-page "https://github.com/jaraco/pytest-enabler")
-    (synopsis "Enable installed pytest plugins")
-    (description "The enabler plugin allows configuration of plugins if
-present, but omits the settings if the plugin is not present.")
-    (license license:expat)))
-
 (define-public python-pytest-mp
   (package
     (name "python-pytest-mp")