[LLC/Data Plane Client] Tests slow down in playback mode beyond timeout limit

Hey all, The tests with issues are @christothes, @pakrym, @heaths have worked with me on debugging this issue. Our findings are as follows:

• The following test is severely slowed down if waitForCompletion is set to true.
• The same applies for the following sample.
• However, for the sync version of the previous sample, the test is significantly slowed regardless of whether the waitForCompletion flag is set to true or false.

@christothes believes this may have to do with instrumentation not correctly handling scenarios where the operation is being returned by a helper class rather than the client itself.

[christothes]

I think more likely that this is a problem with how we proxy Operations. We currently transform the return value by instrumenting the returned operation. However, in the case of waitForCompletion: true, the operation is waited prior to it being returned by the method.

I think we should explore a different approach to how we instrument operations to handle this case.

[JoshLove-msft]

This was fixed in https://github.com/Azure/azure-sdk-for-net/pull/30112