[primer] Enable everything (#2288)

See if we pass all our repos with experimental string processing enabled.
Django probably needed:
- Ignores >= 3.8 only

We could support PEP440 version specifiers, but that would introduce the packaging module as a dependency that I'd like to avoid ... Or I could implement a poor persons version or vendor

Commit history before merge:
 * [primer] Enable everything
 * Add exclude extend to django CLI args for primer
 * Change default timeout to from 5 to 10 mins for a primer project
 * Skip string normalization for Django
 * Limit Django to >= 3.8 due to := operator

src/black_primer/lib.py

@@ -39,7 +39,7 @@ class Results(NamedTuple):
 
 async def _gen_check_output(
     cmd: Sequence[str],
-    timeout: float = 300,
+    timeout: float = 600,
     env: Optional[Dict[str, str]] = None,
     cwd: Optional[Path] = None,
 ) -> Tuple[bytes, bytes]:

src/black_primer/primer.json

@@ -30,13 +30,16 @@
       "py_versions": ["all"]
     },
     "django": {
-      "disabled_reason": "black --check --diff returned 123 on tests_syntax_error.py",
-      "disabled": true,
-      "cli_arguments": ["--experimental-string-processing"],
+      "cli_arguments": [
+        "--experimental-string-processing",
+        "--skip-string-normalization",
+        "--extend-exclude",
+        "/((docs|scripts)/|django/forms/models.py|tests/gis_tests/test_spatialrefsys.py|tests/test_runner_apps/tagged/tests_syntax_error.py)"
+      ],
       "expect_formatting_changes": true,
       "git_clone_url": "https://github.com/django/django.git",
       "long_checkout": false,
-      "py_versions": ["all"]
+      "py_versions": ["3.8", "3.9"]
     },
     "flake8-bugbear": {
       "cli_arguments": ["--experimental-string-processing"],
@@ -53,8 +56,6 @@
       "py_versions": ["all"]
     },
     "pandas": {
-      "disabled_reason": "black-primer runs failing on Pandas - #2193",
-      "disabled": true,
       "cli_arguments": ["--experimental-string-processing"],
       "expect_formatting_changes": true,
       "git_clone_url": "https://github.com/pandas-dev/pandas.git",