fix: add missing subcribe when rebuildOutput, solve subcription megreSchema problem #1141
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There is a "Subscription field must return Async Iterable. Received: undefined" problem when merge Subcription type. It can reproduce here: https://stackblitz.com/edit/graphql-xtfnno?file=index.mjs
I found that the mergeSchema's step
rebuildOutputDefinition
doesn't return subscribe, so it the subscribe will replaced by undefined. this commit add subscribe to return.Hope it helpful.