Issue #3260276 by arunkumark, jasonawant, ravi.shankar, TomTech, quietone, danflanagan8, catch, mikelutz, alexpott: Add static cache to Migration FieldableEntity::getFields

Issue #2843992 by smustgrave, jasonawant, moshnoi, alexpott: Block page visibility paths are not validated, using path a without leading forward slash does not work

Issue #3052430 by tedbow, rpayanm, xjm, jasonawant, smustgrave, tim.plunkett: Remove calls to installEntitySchema for config entity types in Kernel tests

Issue #2450637 by tim.plunkett, jasonawant: Block page visibility option "Show for the listed pages" does not appear to save