chore: set default service name

[dyladan]

This is an alternative to #2154 and fixes #2143

[codecov]

Codecov Report

Merging #2227 (ec802cf) into main (7fa4ff7) will increase coverage by 0.05%.
The diff coverage is 93.33%.

❗ Current head ec802cf differs from pull request most recent head 8099e9e. Consider uploading reports for the commit 8099e9e to get more accurate results

@@            Coverage Diff             @@
##             main    #2227      +/-   ##
==========================================
+ Coverage   92.23%   92.29%   +0.05%     
==========================================
  Files         143      144       +1     
  Lines        5154     5168      +14     
  Branches     1060     1064       +4     
==========================================
+ Hits         4754     4770      +16     
+ Misses        400      398       -2     

Impacted Files	Coverage Δ
...ckages/opentelemetry-core/src/utils/environment.ts	95.83% <ø> (ø)
...ry-exporter-collector/src/CollectorExporterBase.ts	92.15% <ø> (-0.16%)	⬇️
.../opentelemetry-exporter-collector/src/transform.ts	88.69% <ø> (ø)
...lemetry-exporter-collector/src/transformMetrics.ts	95.71% <ø> (ø)
...ages/opentelemetry-exporter-collector/src/types.ts	100.00% <ø> (ø)
...ackages/opentelemetry-exporter-jaeger/src/types.ts	100.00% <ø> (ø)
...ry-resources/src/platform/node/detect-resources.ts	21.73% <ø> (ø)
...sources/src/platform/node/detectors/EnvDetector.ts	88.23% <84.61%> (+1.00%)	⬆️
...ckages/opentelemetry-exporter-jaeger/src/jaeger.ts	90.90% <94.73%> (+3.40%)	⬆️
...ckages/opentelemetry-exporter-zipkin/src/zipkin.ts	100.00% <100.00%> (ø)
... and 7 more

[vmarchaud]

overall lgtm, will approve when the default service name problem has a solution

[dyladan]

Should have just read spec. It states what the fallback should be if not provided.

https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/semantic_conventions/README.md#semantic-attributes-with-sdk-provided-default-value

[obecny]

what about jaeger exporter ?

[obecny]

Please add example to readme upgrade guidelines how to define service name for collector exporter now. Other than that lgtm