Fix: don't validate pom declared group

[willmurphyscode]

If a POM file has a declared group ID, use it to construct the PURL, even if it doesn't have . in it.

[github-actions]

Benchmark Test Results

Benchmark results from the latest changes vs base branch

goos: linux%0Agoarch: amd64%0Apkg: github.com/anchore/syft/test/integration%0Acpu: Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz%0A                                                              │ ./.tmp/benchmark-4501096.txt │%0A                                                              │            sec/op            │%0AImagePackageCatalogers/alpmdb-cataloger-2                                       14.87m ±  7%25%0AImagePackageCatalogers/apkdb-cataloger-2                                        897.4µ ±  7%25%0AImagePackageCatalogers/binary-cataloger-2                                       249.6µ ±  8%25%0AImagePackageCatalogers/dpkgdb-cataloger-2                                       760.6µ ±  5%25%0AImagePackageCatalogers/dotnet-portable-executable-cataloger-2                   27.65µ ±  7%25%0AImagePackageCatalogers/go-module-binary-cataloger-2                             129.3µ ±  6%25%0AImagePackageCatalogers/java-cataloger-2                                         21.27m ±  6%25%0AImagePackageCatalogers/graalvm-native-image-cataloger-2                         129.5µ ± 16%25%0AImagePackageCatalogers/javascript-package-cataloger-2                           499.8µ ±  7%25%0AImagePackageCatalogers/nix-store-cataloger-2                                    365.7µ ±  7%25%0AImagePackageCatalogers/php-composer-installed-cataloger-2                       976.1µ ±  3%25%0AImagePackageCatalogers/portage-cataloger-2                                      626.9µ ±  3%25%0AImagePackageCatalogers/python-package-cataloger-2                               4.057m ±  6%25%0AImagePackageCatalogers/r-package-cataloger-2                                    287.8µ ±  4%25%0AImagePackageCatalogers/rpm-db-cataloger-2                                       677.2µ ±  5%25%0AImagePackageCatalogers/ruby-gemspec-cataloger-2                                 1.142m ±  4%25%0AImagePackageCatalogers/sbom-cataloger-2                                         144.5µ ±  5%25%0Ageomean                                                                         627.7µ%0A%0A                                                              │ ./.tmp/benchmark-4501096.txt │%0A                                                              │             B/op             │%0AImagePackageCatalogers/alpmdb-cataloger-2                                       5.133Mi ± 0%25%0AImagePackageCatalogers/apkdb-cataloger-2                                        184.6Ki ± 0%25%0AImagePackageCatalogers/binary-cataloger-2                                       30.46Ki ± 0%25%0AImagePackageCatalogers/dpkgdb-cataloger-2                                       141.2Ki ± 0%25%0AImagePackageCatalogers/dotnet-portable-executable-cataloger-2                   3.695Ki ± 0%25%0AImagePackageCatalogers/go-module-binary-cataloger-2                             9.906Ki ± 0%25%0AImagePackageCatalogers/java-cataloger-2                                         3.068Mi ± 0%25%0AImagePackageCatalogers/graalvm-native-image-cataloger-2                         8.595Ki ± 0%25%0AImagePackageCatalogers/javascript-package-cataloger-2                           83.81Ki ± 0%25%0AImagePackageCatalogers/nix-store-cataloger-2                                    38.93Ki ± 0%25%0AImagePackageCatalogers/php-composer-installed-cataloger-2                       155.2Ki ± 0%25%0AImagePackageCatalogers/portage-cataloger-2                                      109.8Ki ± 0%25%0AImagePackageCatalogers/python-package-cataloger-2                               985.7Ki ± 0%25%0AImagePackageCatalogers/r-package-cataloger-2                                    42.90Ki ± 0%25%0AImagePackageCatalogers/rpm-db-cataloger-2                                       170.9Ki ± 0%25%0AImagePackageCatalogers/ruby-gemspec-cataloger-2                                 123.3Ki ± 0%25%0AImagePackageCatalogers/sbom-cataloger-2                                         14.20Ki ± 0%25%0Ageomean                                                                         92.97Ki%0A%0A                                                              │ ./.tmp/benchmark-4501096.txt │%0A                                                              │          allocs/op           │%0AImagePackageCatalogers/alpmdb-cataloger-2                                        88.06k ± 0%25%0AImagePackageCatalogers/apkdb-cataloger-2                                         4.034k ± 0%25%0AImagePackageCatalogers/binary-cataloger-2                                         848.0 ± 0%25%0AImagePackageCatalogers/dpkgdb-cataloger-2                                        2.911k ± 0%25%0AImagePackageCatalogers/dotnet-portable-executable-cataloger-2                     132.0 ± 0%25%0AImagePackageCatalogers/go-module-binary-cataloger-2                               281.0 ± 0%25%0AImagePackageCatalogers/java-cataloger-2                                          40.62k ± 0%25%0AImagePackageCatalogers/graalvm-native-image-cataloger-2                           228.0 ± 0%25%0AImagePackageCatalogers/javascript-package-cataloger-2                            1.264k ± 0%25%0AImagePackageCatalogers/nix-store-cataloger-2                                      820.0 ± 0%25%0AImagePackageCatalogers/php-composer-installed-cataloger-2                        3.845k ± 0%25%0AImagePackageCatalogers/portage-cataloger-2                                       2.194k ± 0%25%0AImagePackageCatalogers/python-package-cataloger-2                                16.13k ± 0%25%0AImagePackageCatalogers/r-package-cataloger-2                                      851.0 ± 0%25%0AImagePackageCatalogers/rpm-db-cataloger-2                                        3.914k ± 0%25%0AImagePackageCatalogers/ruby-gemspec-cataloger-2                                  2.291k ± 0%25%0AImagePackageCatalogers/sbom-cataloger-2                                           394.0 ± 0%25%0Ageomean                                                                          1.997k