[Cherry-pick][6.3] Revert "Sema: Prefer the submodule import for access-levels diagnostics" #85913
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(cherry picked from commit 2211824)
This reverts an optimisation that removes duplicated module imports, and adds a regression test that was broken by said optimisation.
This should not break any existing code, it is simply reverting back to previous behaviour.
rdar://164588082
Revert "Sema: Prefer the submodule import for access-levels diagnostics" #85468
This could cause compile times to increase.
Regression test that showed changed semantics (for a patch that should not affect semantics) has been added.
I did not wait for a reviewer to approve the original PR because it was reverting a change that was shown to be broken, and should have affected performance only.