python3Packages.pytestCheckHook: Make disabledTests support sub-expressions

Wrap each elements of disabledTests with parenthesis
so that when __structuredAttrs = true,
people could use sub-expressions an element.

E.g.
```nix
{
  disabledTests = [
    "ClassFoo and test_foo"
    "test_bar"
  ];
}

pkgs/development/interpreters/python/hooks/default.nix

@@ -170,6 +170,14 @@ in
               "test_print"
             ] ++ previousPythonAttrs.disabledTests or [ ];
           });
+          disabledTests-expression = objprint.overridePythonAttrs (previousPythonAttrs: {
+            __structuredAttrs = true;
+            pname = "test-pytestCheckHook-disabledTests-expression-${previousPythonAttrs.pname}";
+            disabledTests = [
+              "TestBasic and test_print"
+              "test_str"
+            ] ++ previousPythonAttrs.disabledTests or [ ];
+          });
           disabledTestPaths = objprint.overridePythonAttrs (previousPythonAttrs: {
             pname = "test-pytestCheckHook-disabledTestPaths-${previousPythonAttrs.pname}";
             disabledTestPaths = [

pkgs/development/interpreters/python/hooks/pytest-check-hook.sh

@@ -57,7 +57,8 @@ EOF
     done
 
     if [ -n "${disabledTests[*]-}" ]; then
-        disabledTestsString="not $(concatStringsSep " and not " disabledTests)"
+        # not (keyword1) and not (keyword2)
+        disabledTestsString="not ($(concatStringsSep ") and not (" disabledTests))"
         flagsArray+=(-k "$disabledTestsString")
     fi