Convert SSH-style template URLs to their HTTPS equivalent when
constructing the packageName for the git-tags datasource lookup,
mirroring what the git-submodules manager does. This allows the
lookup to be authenticated via hostRules credentials on setups
which access the Git host over HTTPS only.
The answers file itself keeps the original URL, so local
'copier update' runs by developers continue to use SSH.
Discussed in #44528