feat(maven): lookup parent homepage/scm information from pom (#9722)

lib/datasource/maven/__fixtures__/child-all-info/meta.xml

lib/datasource/maven/__fixtures__/child-all-info/pom.xml

lib/datasource/maven/__fixtures__/child-empty/meta.xml

lib/datasource/maven/__fixtures__/child-empty/pom.xml

lib/datasource/maven/__fixtures__/child-no-info/meta.xml

lib/datasource/maven/__fixtures__/child-no-info/pom.xml

...urce/maven/__fixtures__/child-parent-cycle/child.meta.xml

...ource/maven/__fixtures__/child-parent-cycle/child.pom.xml

...urce/maven/__fixtures__/child-parent-cycle/parent.pom.xml

...tasource/maven/__fixtures__/child-scm-gitatcolon/meta.xml

...atasource/maven/__fixtures__/child-scm-gitatcolon/pom.xml

...tasource/maven/__fixtures__/child-scm-gitatslash/meta.xml

...atasource/maven/__fixtures__/child-scm-gitatslash/pom.xml

...asource/maven/__fixtures__/child-scm-gitprotocol/meta.xml

...tasource/maven/__fixtures__/child-scm-gitprotocol/pom.xml

lib/datasource/maven/__fixtures__/child-scm/meta.xml

lib/datasource/maven/__fixtures__/child-scm/pom.xml

lib/datasource/maven/__fixtures__/child-url/meta.xml

lib/datasource/maven/__fixtures__/child-url/pom.xml

...atasource/maven/__fixtures__/parent-scm-homepage/meta.xml