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This change is the final change to remove any database tables
from "EXT:ter", and remove any migration from TER v1 (SOAP) to
TER v2 via a scheduler task.

This change removes:
* tx_ter_extensions (versions of an extension)
* tx_ter_extensionqueue (+ its UploadQueue API object)
* ImportExtensionsFromQueueTask (all migrated to ExtensionVersion for now)

All DB rows are written directly into tx_terfe2_domain_model_version and
its related tables.

The API "ExtensionVersion->upload()" now produces everything necessary
including notifications (which can be built via PSR-14 in the future).

This also actually means that extensions are automatically available
RIGHT AWAY after uploading an extension via the GUI or the SOAP API.

Next Steps:
* Refactor our upload API to make it more resistent and moving into a Event Sourcing concept (thinning out all underlying logic from ExtensionVersion again)
* Refactor the permission concept and integrate it nicely
* Remove dependencies to the SOAP API in EXT:ter_fe2

There is some heavy legacy code regarding "where to find details/ the extension files"
exactly in TER FE2.

* Mirror -> use a mirror from extension repository (none given in TER), 5 tx_terfe2_domain_model_version entries
* SOAP -> fetch the t3x from the SOAP API (no tx_terfe2_domain_model_version entry)
* File -> default for all other files

The type for each extension version is stored in "tx_terfe2_domain_model_version.extension_provider" and is removed
to reduce massive code and complexity, having only the "FileProvider" in place
removing the ProviderManager, Interface etc.

MirrorService, MirrorPovider, SoapProvider, SoapService can be removed
reducing cross-concern functionality.

The database table tx_ter_extensionkeys containing all registered
extensionkeys is dropped in favor of "tx_terfe2_domain_model_extension".

This table was synced already anyways, and can now be used within extensions.typo3.org
without having to sync with a cronjob anymore.

Breaking: The information about "title" and "description" is removed, as it wasn't
required via the Web GUI when registering a key already.

The sync task / TER importer now only imports the uploaded versions, the SOAP API
now creates records directly in tx_terfe2_domain_model_extension when
registering a new extension key.

The One-Time-Migration-Script by tomalo (ImportAllExtensionKeysTask) is
now removed as it is not needed anymore.

This will start the expire process.

This reverts commit d5955869.

Removing category, experience, media and search tables.