Issue #3111192 by tim.plunkett, larowlan, mohit_aghera, mstrelan, lauriii,...

Issue #3111192 by tim.plunkett, larowlan, mohit_aghera, mstrelan, lauriii, jibran: Themes have no context of the entity being rendered in preprocessing a layout when using Layout builder

(cherry picked from commit 3f9bc84f)