chore: prepare next release

[opentelemetrybot]

1.30.0

🚀 (Enhancement)

• feat(sdk-metrics): PeriodicExportingMetricReader now flushes pending tasks at shutdown #5242

🐛 (Bug Fix)

• fix(sdk-trace-base): do not load OTEL_ env vars on module load, but when needed #5233

• fix(instrumentation-xhr, instrumentation-fetch): content length attributes no longer get removed with ignoreNetworkEvents: true being set #5229

0.57.0

🚀 (Enhancement)

• feat(opentelemetry-sdk-node): automatically configure metrics exporter based on environment variables #5168 @bhaskarbanerjee

🏠 (Internal)

• refactor(otlp-transformer): re-structure package to prepare for separate entrypoints #5264 @pichlermarc

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.66%. Comparing base (e524148) to head (8d617c2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5274   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files         322      322           
  Lines        8058     8058           
  Branches     1632     1632           
=======================================
  Hits         7628     7628           
  Misses        430      430           

[chancancode]

Noticed an issue here, submitted #5280 to fix