core/pouch: Add logging to deletion methods
core/pouch: Add logging to deletion methods

  The `remove` and `eraseDocument` methods would not log anything,
  making their calls invisible within the log flow while they're very
  important as they destroy data from PouchDB and are used in key places
  like the end of a synchronization run.

cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop