Deprecation: #95456 - Deprecate legacy form templates

Description

Using the legacy form template / partial variants residing in EXT:form/Resources/Private/Frontend/Templates and EXT:form/Resources/Private/Frontend/Partials is deprecated. The legacy templates will be removed in v13.

Impact

No deprecation is logged since it would flood the logs.

Affected Installations

Installations using custom templates for form elements.

Migration

Set your form rendering option "templateVariant" within the form setup from "version1" to "version2" to use the future default templates.

TYPO3:
  CMS:
    Form:
      prototypes:
        standard:
          formElementsDefinition:
            Form:
              renderingOptions:
                templateVariant: version2

Migrate your templates / partials to make them compatible with the ones stored in EXT:form/Resources/Private/FrontendVersion2.