magento2: Unit tests are failing with libxml 2.9.10

Preconditions (*)

Steps to reproduce (*)

1. Checkout platform-health branch from magento2 repository
2. run composer install
3. run vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist

Expected result (*)

1. All unit tests should be passing

Actual result (*)

1. We have 158 test failures

FAILURES!
Tests: 22720, Assertions: 61403, Failures: 158, Skipped: 184, Incomplete: 47.

1. Errors :

1) PayPal\Braintree\Test\Unit\Block\FormTest::testIsVaultEnabled
TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object
/var/www/html/vendor/magento/framework/Session/SessionManager.php:169
/var/www/html/vendor/paypal/module-braintree-core/Block/Form.php:116
/var/www/html/vendor/paypal/module-braintree-core/Test/Unit/Block/FormTest.php:156
2) PayPal\Braintree\Test\Unit\Ui\Component\Report\Filters\Type\DateRangeTest::testPrepare with data set #1 ('test_date', array(array(null, '11-05-2015')), array('2015-05-11T23:59:00+0000', 'lteq'))
Exception: Deprecated Functionality: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /var/www/html/vendor/paypal/module-braintree-core/Test/Unit/Ui/Component/Report/Filters/Type/DateRangeTest.php on line 117
/var/www/html/vendor/magento/framework/App/ErrorHandler.php:61
/var/www/html/vendor/paypal/module-braintree-core/Test/Unit/Ui/Component/Report/Filters/Type/DateRangeTest.php:117
--

Failures (I have 153 failures, I give you only one for example) :

153) Magento\Framework\ObjectManager\Test\Unit\Config\XsdTest::testSchemaCorrectlyIdentifiesInvalidXml with data set "virtualtype with digits_and_prefix_slash" ('<config xmlns:xsi="http://www...onfig/>', array('Element 'virtualType', attrib...e: 2\n', 'Element 'virtualType', attrib...e: 2\n', 'Element 'virtualType', attrib...e: 2\n'))
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
     0 => 'Element 'virtualType', attrib...e: 2\n'
-    1 => 'Element 'virtualType', attribute 'name': '\777Digits\IsNotAllowed' is not a valid value of the atomic type 'phpClassName'.\n
+    1 => 'Element 'virtualType', attribute 'name': Warning: No precomputed value available, the value was either invalid or something strange happened.\n
     Line: 2\n
     '
-    2 => 'Element 'virtualType', attrib...e: 2\n'
 )

Additional Information

Same issue is reported here. Launching Unit tests with M2.4.4 and PHP8.1 gives errors and failures

Additional Notes

1. I prepared a branch on how to run unit tests on Github Actions (based on top of platform-health branch): https://github.com/magento/magento2/compare/platform-health...ihor-sviziev:run-unit-tests

You can find the result of the execution here: https://github.com/ihor-sviziev/magento2/runs/4353240450?check_suite_focus=true

1. When using centos based image (https://warden.dev/) - we have different test failures.
2. I noted that the amount of ran unit tests on Magento build is different: Example: https://public-results-storage-prod.magento-testing-service.engineering/reports/magento/magento2/pull/34723/e5b7c4fa8fbdcd87b9a7e2551dc072ab/Unit/console-error-logs.html At the end of CE tests

Tests: **6875**, Assertions: 14857, Failures: 1, Skipped: 99, Incomplete: 7.

But when we’re running tests locally, we have the following output (4X more tests were run!):

Tests: **22720**, Assertions: 61407, Failures: 158, Skipped: 184, Incomplete: 47.

/CC @andrewbess @xmav

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.