feat(saved queries): security perm simplification (#11764)

* feat(saved queries): security perm simplification

* migration script and frontend

* add downgrade procedure

* downgrade procedure, inferred from the upgrade data

* fix JS test

* improve code

* add tests for role migration

* more tests and a short description for each one

* Improve readability

* simplify dataclass creation

* fix dataclass

superset/migrations/shared/__init__.py

@@ -0,0 +1,16 @@
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