Make MemCached GA

[muthu-mps]

Checklist

Integration	Time Duration	Documentation	Move To GA
MemCached	11 Months	Verified	💚

Data streams	Time Duration	Automated Tests	Simulated / Live	Manual Testing	Move To GA
stats	11 Months	Yes	Live	done	💚

Manual Tests

Issues:

• [Memcached] Update the documentation #5997

[ishleenk17]

@muthu-mps : You might want to check if doing this backlog task is important before moving it to GA.
https://github.com/elastic/observability-dev/issues/2313