All functions in locale.fetch.inc are deprecated

All functions in locale.fetch.inc are deprecated and moved to the LocaleFetch service class.

locale_translation_batch_update_build is replaced by \Drupal::service(LocaleFetch::class)->buildUpdateBatch($projects, $langcodes, $options)

locale_translation_batch_fetch_build is replaced by \Drupal::service(LocaleFetch::class)->buildFetchBatch($projects, $langcodes, $options)

_locale_translation_fetch_operations -> There is no replacement.

Important note: Before 11.4 was released the method names were changed: https://www.drupal.org/node/3589759