Delete StackTraceHelper code that won't fire

[hueifeng]

These changes can be clearly seen that the corresponding processing has been done above the code block, so it will not be executed in every deleted code block.

[pranavkm]

Build errors on this one. If you're eliminating nulls, could you annotate this file with #nullable enable? This should give us more confidence that there aren't other nullability issues lurking here.

[hueifeng]

@pranavkm I think it is ok, do I need to modify this file to add #nullable enable?
Or do I need to modify our library to be empty <Nullable>enable</Nullable>?

[pranavkm]

Just the one file since it's shared.

[hueifeng]

@padmasrid I submitted the changes.