Issue #3568963 by cicciobat: Use injected FormBuilder service instead of...

Francesco Maria Battagliarequested to merge
issue/search_api_page-3568963:3568963-use-injected-formbuilder into 8.x-1.x

Issue #3568963 by cicciobat: Use injected FormBuilder service instead of static call in Block plugin

Closes #3568963

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