Spec service.environment for logs

[SylvainJuge]

• add service.environment to the fields used for log correlation
• move log correlation fields from log-reformatting to log-correlation
• clarify the expected behavior when ECS logging is used in the application and agent providing fallback values.

Relates to #765

Follow-up tasks

• open PR to add this to documentation

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• May the instrumentation collect sensitive information, such as secrets or PII (ex. in headers)?
  • n/a: only relates to log-correlation, which does not deal with sensitive data.
• Create PR as draft
• Approval by at least one other agent
• Mark as Ready for Review (automatically requests reviews from all agents and PM via CODEOWNERS)
  • Remove PM from reviewers if impact on product is negligible
  • Remove agents from reviewers if the change is not relevant for them
• Approved by at least 2 agents + PM (if relevant)
• Merge after 7 days passed without objections
  To auto-merge the PR, add /schedule YYYY-MM-DD to the PR description.
• Create implementation issues through the meta issue template (this will automate issue creation for individual agents)
• If this spec adds a new dynamic config option, add it to central config. n/a

[apmmachine]

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• Start Time: 2023-03-06T05:22:00.029+0000

• Duration: 3 min 49 sec