Tests/admin/wpListTable: split the test class (Trac 53010)

[jrfnl]

Tests/admin/wpListTable: create a testcase for tests for WP_List_Table

Most tests testing the WP_List_Table class will need the same set up/tear down fixtures, so moving those fixtures from the actual test class to a separate abstract TestCase class will allow for expanding the tests more easily.

While doing this, we ran the tests in isolation using the --filter CLI argument and discovered that there was a previously unrecognized presumption in the fixtures that the $hook_suffix global would always be set.

This presumption proved incorrect as was demonstrated by the Undefined global variable $hook_suffix warning being thrown when running the tests.

This warning has been fixed now in the new Admin_WpListTable_TestCase by adding some additional defensive coding and making sure that the global state is always brought back to its original state, including if that original state means that the $hook_suffix global variable was not set.

Tests/admin/wpListTable: split off tests for the get_column_info() method to separate test class

This will allow the test class to be compatible with PHPUnit 11 using the new Admin_WpListTable_TestCase class as introduced in the previous commit.

Includes removing method level @covers tags in favour of class level @covers tags to allow for supporting PHPUnit 11 attributes instead of annotations.

Tests/admin/wpListTable: split off tests for the get_views_links() method to separate test class

This will allow the test class to be compatible with PHPUnit 11 using the new Admin_WpListTable_TestCase class as introduced in the previous commit.

Includes removing method level @covers tags in favour of class level @covers tags to allow for supporting PHPUnit 11 attributes instead of annotations.

Tests/admin/wpListTable: rename the original test class to be more descriptive for the remaining tests

The remaining tests in the original test class all cover the magic methods and those are very closely related, so it is perfectly fine for those tests to be grouped together in one test class.

This commit, however, does rename the test class to use the new naming conventions, both for the class name as well as the file name.
It also includes removing method level @covers tags in favour of class level @covers tags to allow for supporting PHPUnit 11 attributes instead of annotations.

This will allow the test class to be compatible with PHPUnit 11.

Trac ticket: https://core.trac.wordpress.org/ticket/53010

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