When a single resource is preloaded twice in ngtsc, the second request would be recognized as in-flight in which case `undefined` would be returned, which signals to the compilation that is can resume synchronously. The compilation would then proceed immediately and call `load`, only to find out that the request is still in-flight which is not allowed. This commit caches the Promise of the in-flight fetch requests, such that subsequent preload requests can return the corresponding Promise instance. PR Close #27357
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