Allow null for traceparent generator

[fractalwrench]

Goal

Allows null as a valid value when generating a traceparent. This is because the feature may not be enabled in which case we want to avoid generating a traceparent.

Testing

Updated unit test coverage.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Manifest Files

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.93%. Comparing base (f477bc3) to head (27e93e8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1137      +/-   ##
==========================================
- Coverage   82.94%   82.93%   -0.01%     
==========================================
  Files         435      435              
  Lines       11284    11286       +2     
  Branches     1750     1751       +1     
==========================================
+ Hits         9359     9360       +1     
  Misses       1149     1149              
- Partials      776      777       +1     

Files	Coverage Δ
...in/java/io/embrace/android/embracesdk/Embrace.java	81.43% <ø> (ø)
...internal/api/delegate/NetworkRequestApiDelegate.kt	52.63% <66.66%> (-0.31%)	⬇️

[bidetofevil]

LGTM