[breaking change detector] Fake breaking item about "Method `XXX.XXX` changed from `asynchronous` to `synchronous`"

[msyyc]

For azure-sdk#8278, the following breaking items reported are not right since each API of Mgmt SDK has async and sync format at the same time.

Although list_by_service which is paging operation has no keyword async, it returns AsyncIterable type so we could still treat this API as async API.