Add ci.pipeline.run.duration metric

[cyrille-leclerc]

• Add ci.pipeline.run.duration{ci.pipeline.id=xxx, ci.pipeline.run.result=yyy} histogram metric
  • Config params otel.instrumentation.jenkins.run.metric.duration.allow_list and otel.instrumentation.jenkins.run.metric.duration.allow_list: Java regex strings
• Cleanup some docs

Testing done

Submitter checklist

• [ ] Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• [ ] Ensure that the pull request title represents the desired changelog entry
• [ ] Please describe what you did
• [ ] Link to relevant issues in GitHub or Jira
• [ ] Link to relevant pull requests, esp. upstream and downstream changes
• [ ] Ensure you have provided tests - that demonstrates feature works or fixes the issue

[cyrille-leclerc]

@miraccan00 could you review this PR please?