Revert "[basic] Add a simple vector backed 2 stage multi map." #29059
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Reverts #29035
ASAN does not like these new unit tests:
Failing Tests (2):
12:46:39 Swift-Unit :: Basic/./SwiftBasicTests/FrozenMultiMapCustomTest.SimpleIter
12:46:39 Swift-Unit :: Basic/./SwiftBasicTests/FrozenMultiMapCustomTest.RandomAgainstStdMultiMap