One more micrometer AsyncInstrumentRegistry fix #5118
Merged
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This is pretty much a continuation of #5106
This morning I realized that we can't ever remove the recorder callback (even if there are no measurements being recorded), because that way we'd lose the information that a particular async instrument was already created - and OTel Meter still remembers that, so the next time somebody would try to create a gauge (e.g.) with the same name they'd not get their metrics, and receive an error log from OTel SDK instead.