Remove the otlp trace exporter limit of SpanEvents when exporting

[hanyuancheung]

Fix #2607

Remove the limit of SpanEvents when exporting.

[codecov]

Codecov Report

Merging #2616 (8af4f24) into main (b675dda) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #2616     +/-   ##
=======================================
- Coverage   76.2%   76.1%   -0.1%     
=======================================
  Files        173     173             
  Lines      12234   12234             
=======================================
- Hits        9324    9320      -4     
- Misses      2667    2671      +4     
  Partials     243     243             

Impacted Files	Coverage Δ
sdk/internal/env/env.go	100.0% <ø> (ø)
...ers/otlp/otlptrace/internal/tracetransform/span.go	96.5% <100.0%> (-0.2%)	⬇️
sdk/trace/config.go	100.0% <100.0%> (ø)
sdk/trace/provider.go	82.5% <100.0%> (+<0.1%)	⬆️
sdk/trace/batch_span_processor.go	80.2% <0.0%> (-1.9%)	⬇️