These migrations insert the merger change events that are needed for the 2025
municipality mergers.
The migrations executed by the `migrations` service insert the actual merger
change events for
- mergers where the resulting organisation is a new organisation (these were
added earlier in #442);
- mergers where the resulting organisation is an already existing, active
organisation; and
- the special case where the municipality Borsbeek is merging with the
municipality Antwerp, thereby creating a new district Borsbeek.
The migration executed by the `migrations-triggering-indexing` service updates
the status of the necessary organisations:
- the new municipalities/OCMWs/district are set from "Being founded" (nl. "In
oprichting") to "Active"
- the other municipalities are changed from "Active" to "Not active"
- organisations that simply remain active before and after the merger are *not*
updated
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