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Fix phpunit SIMPLETEST_BASE_URL / D12 core-tests failures in drupal-core and drupal-contrib #349

Job	Run time
Contrib ui_icons issue fork (GitLab-native, GH)	5m 48s
Contrib skipto D12 (plain, GH)	7m 29s
Contrib entity_browser issue fork (GH)	13m 0s
Contrib ${{ (vars.CONTRIB_TEST_PROJECT \|\| 'token') }} issue fork	-1s
Contrib ${{ matrix.project }} D${{ matrix.drupal_version }} (plain)	-1s
	26m 15s