Issue #3240971 by phenaproxima, s_leu, tedbow: Support install profiles/distributions

package_manager/src/ComposerUtility.php

package_manager/tests/fixtures/distro_core/composer.json

package_manager/tests/fixtures/distro_core/composer.lock

...ager/tests/fixtures/distro_core_recommended/composer.json

...ager/tests/fixtures/distro_core_recommended/composer.lock

package_manager/tests/src/Kernel/ComposerUtilityTest.php

tests/fixtures/fake-site/composer.json

tests/fixtures/fake-site/composer.lock

...ject_staged_validation/no_core_requirements/composer.lock

tests/src/Build/UpdateTestBase.php

tests/src/Kernel/UpdaterTest.php