rero / rero-mef / 34366759487

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feat(concepts): migrate the association identifier with alembic

The association identifiers live in the search index, so the concept
records have to be reindexed before their MEF records can be rebuilt on
the normalised BNF number. Nothing changes shape in the database, but
alembic is what records whether an instance has already run the
migration, and the other revisions of this module reindex the same way.

* The revision refuses to run while a live concept index does not map
  the association fields as its mapping file declares. An index created
  before those fields existed maps them dynamically, and a dynamically
  mapped `_association_level` becomes a text field that the match level
  filter silently never matches. Failing leaves the revision unstamped,
  so it runs again after `invenio rero es index update-mapping`.
* The indexing queue is drained in process, as `0d0b3009dbe0` and
  `d8536341fc5e` already do, so the migration is one `alembic upgrade`
  rather than a sequence of commands to run by hand.
* The MEF records left without any entity are deleted afterwards.
* `downgrade` only explains itself: the clusters cannot be rebuilt on an
  identifier the code no longer computes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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