fix(core/release): rework publish and unpublish

Q	A
Bug fix?	y
New feature?	n
BC breaks?	n
Deprecations?	n
Fixed tickets?	#843
Documentation?	n

Renamed column revision_before_publish_id -> rollback_revision_id
Revision on ReleaseRevision not nullable
Add new type on releaseRevision managed by enum
Rework publish and unpublish
Rework rollback publish and unpublish

Extra: Introduced AbstractCoreController, the idea is that in the future all core controllers extends this one. Currently this coreController class adds a helper function for getting the clicked button in a submitted form

ems-project / elasticms

fix(core/release): rework publish and unpublish #912