Use default setuptools-scm tag parsing

[rwgk]

Description

Removes the custom tag_regex settings from cuda-bindings, cuda-core, cuda-pathfinder, and cuda-python, allowing setuptools-scm to parse complete tag versions with its default parser. Also updates the corresponding wording in CONTRIBUTING.md.

The custom expressions primarily existed to strip rcN; that behavior conflicts with the current release validation, and partial regex matching can silently truncate unexpected suffixes. See the full rationale.

Validation

• pre-commit run --all-files
• Verified with setuptools-scm 10.2.3 that default parsing preserves rcN and .dev0, handles the cuda-core- and cuda-pathfinder- tag prefixes, and advances a .dev0 preview anchor correctly on a descendant commit.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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