Return metric SDK testing using metrictest

[MrAlias]

Follow up to #1977

Part of open-telemetry/opentelemetry-go#2861

[MadVikingGod]

You beat me to it.

[codecov]

Codecov Report

Merging #2224 (acc0502) into main (8b86920) will increase coverage by 6.2%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main   #2224     +/-   ##
=======================================
+ Coverage   70.7%   77.0%   +6.2%     
=======================================
  Files        139     141      +2     
  Lines       6386    6432     +46     
=======================================
+ Hits        4517    4953    +436     
+ Misses      1741    1324    -417     
- Partials     128     155     +27     

Impacted Files	Coverage Δ
.../github.com/gocql/gocql/otelgocql/internal/cass.go	95.1% <0.0%> (ø)
...n/github.com/gocql/gocql/otelgocql/test/version.go	0.0% <0.0%> (ø)
instrumentation/runtime/runtime.go	74.0% <0.0%> (+20.2%)	⬆️
...ion/github.com/gocql/gocql/otelgocql/instrument.go	62.5% <0.0%> (+62.5%)	⬆️
...ntation/github.com/gocql/gocql/otelgocql/config.go	67.3% <0.0%> (+67.3%)	⬆️
instrumentation/host/host.go	74.4% <0.0%> (+74.4%)	⬆️
...ation/github.com/gocql/gocql/otelgocql/observer.go	75.1% <0.0%> (+75.1%)	⬆️
instrumentation/host/version.go	100.0% <0.0%> (+100.0%)	⬆️
...entation/github.com/gocql/gocql/otelgocql/gocql.go	100.0% <0.0%> (+100.0%)	⬆️
...tation/github.com/gocql/gocql/otelgocql/version.go	100.0% <0.0%> (+100.0%)	⬆️