Support `{name}` and `{version}` placeholders in `use_repo`
This allows module extensions to reliably namespace repos created by individual modules, even in the presence of `multiple_version_override`, without causing additional churn for users during version bumps. In particular, projects with a publishing workflow that patches in the `version` attribute of the `module` function don't need to modify that workflow to e.g. patch a global constant or also search for the old version in `use_repo` call arguments.
Context: https://bazelbuild.slack.com/archives/C09E58X3AQ7/p1764934858912079
RELNOTES: The values of keyword arguments passed to `use_repo` can now contain the special substrings `{name}` and `{version}`, which are treated as equivalent to the corresponding attributes of the current module.
Closes #27890.
PiperOrigin-RevId: 845156030
Change-Id: Ic5d777645bf6a5ca67fa6cb577f426c96beda894
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