Merge branch 'lp/repack-propagate-promisor-debugging-info' into seen

Merge branch 'lp/repack-propagate-promisor-debugging-info' into seen

When fetching objects into a lazily cloned repository, .promisor
files are created with information meant to help debugging.  "git
repack" has been taught to carry this information forward to
packfiles that are newly created.

Retracted.
cf. <agx_GPfBKpkSc3Gx@lorenzo-VM>

* lp/repack-propagate-promisor-debugging-info:
  repack-promisor: add missing headers
  t7703: test for promisor file content after geometric repack
  t7700: test for promisor file content after repack
  repack-promisor: preserve content of promisor files after repack
  repack-promisor add helper to fill promisor file after repack
  pack-write: add explanation to promisor file content