endpoint parsing exporter fixes and small cleanup in tracer

[tsloughter]

No description provided.

[codecov]

Codecov Report

Merging #212 (a2fecab) into main (4b38bb4) will increase coverage by 0.29%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
+ Coverage   35.25%   35.55%   +0.29%     
==========================================
  Files          64       64              
  Lines        3341     3350       +9     
==========================================
+ Hits         1178     1191      +13     
+ Misses       2163     2159       -4     

Flag	Coverage Δ
api	51.61% <ø> (ø)
elixir	14.03% <ø> (ø)
erlang	35.63% <88.23%> (+0.33%)	⬆️
exporter	19.06% <87.50%> (+0.48%)	⬆️
sdk	71.69% <100.00%> (+0.13%)	⬆️

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Impacted Files	Coverage Δ
apps/opentelemetry_api/src/otel_ctx.erl	79.16% <ø> (ø)
...ntelemetry_exporter/src/opentelemetry_exporter.erl	77.87% <87.50%> (+4.79%)	⬆️
apps/opentelemetry/src/otel_tracer_default.erl	100.00% <100.00%> (ø)
apps/opentelemetry/src/otel_metric_accumulator.erl	79.16% <0.00%> (+2.08%)	⬆️

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