[7.1.0] Remove user specific path from the lockfile (Fixes #19621) (#21009)

If a local registry is specified using a workspace placeholder, the
lockfile stores location details of the files with resolved workspace
information, including user-specific paths.

To fix that: Updating the logic to use the workspace placeholder
%workspace% during lockfile writing and reverting to the resolved paths
when reading.

PiperOrigin-RevId: 600876401
Change-Id: I6162d8e8f1fe5e29b7899fc5bb218d1b6be926d0