feat(manager/regex)!: allow arbitrary regex groups for templates (#12296)

Allow the usage of arbitrary capture groups inside of regex manager templates and further adds refactor which this allows.

BREAKING_CHANGE
Only regex managers using the combination matchStringStrategy are affected of this change!
Currently capture groups which are empty but still match the regex are ignored.
This is no longer the case!
Subsequent matchGroups will now overwrite previous ones, even if the later one is empty.