[Patch port] fix(core): missing useExisting providers throwing for optional calls #61152
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Note: this is a patch port of #61137.
Fixes that the runtime was throwing a DI error when attempting to inject a missing
useExisting
provider, despite the call being optional.The problem was that when the provider has
useExisting
, we do a secondinject
call under the hood which didn't include the inject flags from the original call.Fixes #61121.