Merge branch 'jk/unused-post-2.42'

Unused parameters to functions are marked as such, and/or removed,
in order to bring us closer to -Wunused-parameter clean.

* jk/unused-post-2.42: (22 commits)
  update-ref: mark unused parameter in parser callbacks
  gc: mark unused descriptors in scheduler callbacks
  bundle-uri: mark unused parameters in callbacks
  fetch: mark unused parameter in ref_transaction callback
  credential: mark unused parameter in urlmatch callback
  grep: mark unused parmaeters in pcre fallbacks
  imap-send: mark unused parameters with NO_OPENSSL
  worktree: mark unused parameters in noop repair callback
  negotiator/noop: mark unused callback parameters
  add-interactive: mark unused callback parameters
  grep: mark unused parameter in output function
  test-trace2: mark unused argv/argc parameters
  trace2: mark unused config callback parameter
  trace2: mark unused us_elapsed_absolute parameters
  stash: mark unused parameter in diff callback
  ls-tree: mark unused parameter in callback
  commit-graph: mark unused data parameters in generation callbacks
  worktree: mark unused parameters in each_ref_fn callback
  pack-bitmap: mark unused parameters in show_object callback
  ref-filter: mark unused parameters in parser callbacks
  ...

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