fix: avoid ending spans multiple times

[seemk]

#379 changed the existing code such that ending a span multiple times sends it to the processor/exporter multiple times. With the previous logic this did not happen.

Added a quick bailout when ending a span and it has already ended.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (2d7f897) 62.37% compared to head (c0c8292) 62.39%.

❗ Current head c0c8292 differs from pull request most recent head 6969ff9. Consider uploading reports for the commit 6969ff9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   62.37%   62.39%   +0.01%     
==========================================
  Files         253      253              
  Lines       11765    11770       +5     
==========================================
+ Hits         7339     7344       +5     
  Misses       4426     4426              

Impacted Files	Coverage Δ
...nTelemetrySdk/Trace/RecordEventsReadableSpan.swift	96.05% <100.00%> (+0.09%)	⬆️

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[nachoBonafonte]

Oh, yes, good catch, the previous code was just exiting the block instead of the function, my bad

[nachoBonafonte]

Thanks a lot for your contribution