fix(api): use active context as default in NoopTracer #3476
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Which problem is this PR solving?
API without SDK usecase (only proagator and context manager and maybe some instrumentations used) doesn't work is one relies on context manager.
Short description of the changes
To support the API without SDK use cast to forward a span context it's needed to fetch active context via ContextManager also in NoopTracer. Otherwise only direct passing of a context works but not if context.with() is used.
Type of change
Please delete options that are not relevant.
How Has This Been Tested?
added unittest
Checklist: