[#12048] Migrate tests for CreateNotificationActionTest

[InfinityTwo]

Part of #12048

Outline of Solution

Added the unit tests for CreateNotificationActionTest for PostgreSQL.

However, two of the tests (testExecute_addNotification_success() and testExecute_invalidParameter_throwsInvalidHttpParameterException()) that fails are disabled, which is inline with the originally disabled tests since it did not work in the first place. The goal here for now was to migrate the code without changing functionality.

[github-actions]

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[domoberzin]

Thanks for the PR, just need some auth/access control tests to be added. Good work!

[domoberzin]

add some access control tests as well

[domoberzin]

just to add on, i believe the old tests do some authentication (i.e. loginAsAdmin or loginAsInstructor, would be good to carry over that logic where possible

[InfinityTwo]

Thanks for the catch, I've added the access control tests 😄