release:prepare truncates Git URL when pushing the tag

### Affected version

3.3.1

### Bug description

If the project to be released has an inner module that is accessed via `../child`, the Git URL is truncated.

If the Git structure looks like this

Repo-Root
| ---- parent
| ---- child

and "parent" has "child" as an inner module and has "scm.developerConnection=scm:git:https://github.com/foobar/repo.git", then an mvn release:prepare in "parent" will attempt to push the tag to "https://github.com/foobar/", which will of course fail.

See for example https://github.com/dbusche/test-mvn-release.git

Start by reproducing the issue with the linked nested-module example and an mvn release:prepare run. Trace how the scm.developerConnection Git URL is handled when the parent module pushes the tag; done means the complete repository URL is used instead of the truncated https://github.com/foobar/ path.

Written by the indexing model from the issue text.