[!!!][TASK] Merge tx_ter_extensiondetails into tx_ter_extensions

Merged Benni Mack requested to merge feature/migrate-extensiondetails-into-one-db-table into develop

There is a simple connection between tx_ter_extensiondetails and tx_ter_extensions (extensionuid field), but both tables always need to be kept in sync. This is unnecessary overhead. For this reason, all data is now moved into tx_ter_extensions (which will later be moved into tx_terfe2_domain_model_version).

After adding the new fields to the database table "tx_ter_extensions", A onetime CLI command "ter:migrateextensiondetails" is executed and syncs all existing data into the main "tx_ter_extensions".

"tx_ter_extensiondetails" can be dropped after the migration, as it is not used anymore at all.

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