… pytest continues to run indefinitely even after the tests have passed.

…e symbol ref key.

Usage:

write_entry_to_storage
|_ compact_and_remove_deleted_indexes (unused, no impact)
  |_ writes the symbol ref a second time
|_ overwrite_symbol_tree
  |_ writes the symbol ref a second time
|_ rewrite_entry
  |_ recover_deleted
    |_ writes the symbol ref a second time
  |_ remove_and_rewrite_version_keys
    |_ writes the symbol ref a second time
  |_ scan_and_rewrite
    |_ writes the symbol ref a second time

overwrite_symbol_tree is used in:

    initial sync process in replication (no impact really, we don't expect stuff to be readable during the initial sync)
    fix_symbol_trees (unused)

recover_deleted is only used in tests

remove_and_rewrite_version_keys is unused

scan_and_rewrite is used in fix_ref_key which is unused

Testing limited as most call sites are unused. I verified that replication still works correctly after this change.

…'t hang the CI suite for 6 hours...