Merge the autosdk and otelglobal instrumentation

[MrAlias]

We currently have two ways to instrument the opentelemetry-go global API. These should be unified into a single probe. If the global API being used is a version prior to the auto/sdk package integration the original otelglobal instrumentation should be used. Otherwise, the autosdk instrumentation should be used.

[MrAlias]

This "merge" isn't needed. Based on #1405 all we will need to do is keep the autosdk probe as is and instrument the newSpan function to "turn on" the use of auto/sdk in the global API. The current global instrumentation will continue to work if the code-path is not changed based on this flag setting.

We will need to work out how to instrument (*tracer).newSpan only for versions > 1.32 of otel. That can be included in #1399 as an action item.