Updates ExtensionUpdater to do correct project to package conversion

Problem/Motivation

follow-up #3296261: Add the ability to map package names to project names and vice-versa

Instead of doing #3304142: Do not assume that Composer package names will exactly match Drupal projects names which is to do just conversion everywhere lets first try only taking on the change in ExtensionUpdater. This is will probably mean we need to also fix a bunch of other tests and/or the test fixtures but lets not try to fix all the validators themeselves in 1 issue if we don't have to .

Proposed resolution

Update ExtensionUpdater to use the new methods added in #3296261: Add the ability to map package names to project names and vice-versa. basically don't assume that for project_a the package name will be drupal/project_a but use \Drupal\package_manager\ComposerUtility::getProjectForPackage and \Drupal\package_manager\ComposerUtility::getPackageForProject as needed

This will make many tests fail. update the test and/or fixtures to make them pass.

Remaining tasks

User interface changes

API changes

Data model changes