Use new slices for log_statements

[jefferbrecht]

Description

Map-style config was removed in open-telemetry/opentelemetry-collector-contrib#16773. Slice-style config has been supported for some time so this should work without a collector upgrade.

Related issue

N/A

How has this been tested?

Updated unit tests, will let integration tests run.

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.