95f3337bb5
This commit reverts changes to AbstractCacheManager since iterating over the caches in a for-loop and a stream is duplicated effort. This commit reverts changes to DefaultRenderingResponseBuilder, RouterFunctions, and OriginHandshakeInterceptor since order matters for those use cases: they were originally based on the semantics of LinkedHashSet or LinkedHashMap; whereas, Set.copyOf() and Map.copyOf() do not provide any guarantees regarding ordering. This commit also applies analogous changes to "sibling" implementations across Servlet mocks as well as Web MVC and WebFlux. See gh-29321
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