cmd/go/internal/vcs: include Subversion VCS build information

[bsdcode]

The existing implementation lacks the Status function for retrieving VCS build
information for Subversion. As a consequence, binaries aren't stamped with the
Revision, CommitTime and Uncommitted information from SVN repositories.

This change provides the svnStatus function and retrieves the information by
running svn info and svn status commands.

Fixes #73444

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