Deprecation: #85802 - Move FlexFormService from EXT:extbase to EXT:core

See forge#85802

Description

Move FlexFormService from EXT:extbase to EXT:core.

Impact

The PHP class \TYPO3\CMS\Extbase\Service\FlexFormService has been moved from the system extension extbase to core. The PHP class has been renamed to \TYPO3\CMS\Core\Service\FlexFormService .

Affected Installations

Any TYPO3 installation where this PHP class is in use within a TYPO3 extension.

Migration

Use the new namespace to reference the \TYPO3\CMS\Core\Service\FlexFormService .