feat(opentelemetry): Remove top level startActiveSpan (#11380)

ref #10100

Author: AbhiPrasad

packages/opentelemetry/src/trace.ts

@@ -97,11 +97,6 @@ export function startSpanManual<T>(
   });
 }
 
-/**
- * @deprecated Use {@link startSpan} instead.
- */
-export const startActiveSpan = startSpan;
-
 /**
  * Creates a span. This span is not set as active, so will not get automatic instrumentation spans
  * as children or be able to be accessed via `Sentry.getActiveSpan()`.