Make packages extensionmanager and install optional for typo3/minimal in TYPO3 13

[ohader]

This requires some refactoring of server-side ComposerPackagesService and client-side composerHelper.js, e.g.

        'typo3/minimal'   => [
            'typo3/cms-backend' => true,
            'typo3/cms-core' => true,
            'typo3/cms-extbase' => true,
            'typo3/cms-extensionmanager' => ['versions' => 8, 9, 10, 11, 12],
            'typo3/cms-filelist' => true,
            'typo3/cms-fluid' => true,
            'typo3/cms-frontend' => true,
            'typo3/cms-install' => ['versions' => 8, 9, 10, 11, 12],
            'typo3/cms-recordlist' => true,
            'typo3/minimal' => true,
        ],