php 8.1 support

[glo45343]

Deprecated: preg_match_all(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/workspace/vendor/magento/magento2-functional-testing-framework/src/Magento/FunctionalTestingFramework/Util/TestGenerator.php on line 2104

[m2-assistant]

Hi @glo45343. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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