Move IP extraction code to common

We have a method to get the best matching IP for a given request which is duplicated across a few projects. It should be moved to this repo.

The method in question:

• https://gitlab.eclipse.org/eclipsefdn/it/api/eclipse-openvsx-api/-/blob/main/src/main/java/org/eclipsefoundation/openvsx/services/impl/DefaultFoundationOperationService.java?ref_type=heads#L181
• https://gitlab.eclipse.org/eclipsefdn/it/api/eclipsefdn-committer-paperwork-api/-/blob/main/src/main/java/org/eclipsefoundation/committerpaperwork/services/impl/DefaultPaperworkService.java?ref_type=heads#L609
• https://gitlab.eclipse.org/eclipsefdn/it/api/eclipsefdn-profile-api/-/blob/main/src/main/java/org/eclipsefoundation/profile/helpers/UserDeleteHelper.java?ref_type=heads#L87