Make Golang GA

[harnish-elastic]

• Make Golang GA with the following data streams
  • Metrics:
    • expvar
    • heap

Issue & Enhancements

• [O11y][Golang] Conflicts in host.ip field #7240
  • The host.ip field has conflicts because host.ip is not mentioned in the ecs.yml
• [O11y][Golang] Missing metric_type in fields.yml file #7248
  • metric_type is missing for the golang.expvar.last_finished.ns field.
• [O11y][Golang] Fix description in README.md #7850
  • Fix README descriptions.

Open PRs / Issues

• [Golang] Not able to store tracker in integration #5171