Issue #3498739 - Allow returning a 403 response when blocking

Closes #3498739

added 3 commits

• 0bc09453 - #3498739 - Add test to check the new return_403 option works as expected.
• cd3751ed - #3498739 - Tweak the config form visibility of return_403 option to match the...
• 7671b56d - #3498739 - Set the new return_403 value in config to false.

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added 1 commit

• 0a28409f - #3498739 - Fix PHPCS violations with the newly added logic.

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• 4f0fdf51 - #3498739 - Fix PHPCS violations with the newly added logic.

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• 8224dcb9 - #3498739 - Ensure $_SESSION['restrict_ip'] always gets unset even on a 403 route.

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