Add an automatic check for asserting the version of parent poms

Problem: it happens that we cherry-pick in branches pom.xml files containing a wrong parent version. (e.g. https://github.com/xwiki/xwiki-platform/commit/787d775b1180079dbee6ad7233f30a9b50d91492#diff-1cb6fb1cf76a625a61bb79f4dd7fe71d535e0ae2f5513ca7131ef0610142230fR28) In most case the CI don't catch those mistakes because the version does exist, and we only find those errors at release time.
We should find a way to check that the parent version of our pom.xml files matches the major/minor version that can be guessed from the branch.