Ensure we cannot create project not following nuxeo-connect-client pattern

Using PrototypeCreator it is possible to create a trial project not following org.nuxeo.connect.update.PackageUtils#SYMBOLIC_NAME_PATTERN rule and make unable to download Studio Package using `/nuxeo/studiopackage` endpoint called from a Nuxeo Instance.

See: Test

public void bla() {
        String pkg = "20210215dy-someon-0.0.0-SNAPSHOT";
        String packageName = PackageUtils.getPackageName(pkg);
        assertThat(packageName).isEqualTo("20210215dy-someon"); //null here.

        String version = PackageUtils.getPackageVersion(pkg);
        assertThat(version).isEqualTo("0.0.0-SNAPSHOT");
    }

PackageRepository
com.nuxeo.connect.packagerepository.PackageRepositoryComponent#getStudioPackageFile