changelogv2: `copies-side-data` now implies `changelogv2`...
changelogv2: `copies-side-data` now implies `changelogv2`
To store information about file changes and copies only requires sidedata
support for the changelog. So we only enables `changelogv2`. This is less
impactful and should help us to ship the changeset centric copy tracing sooner.
Differential Revision:
https://phab.mercurial-scm.org/D10662