Fix config for otlp example and integration test

[krlohnes]

Fixes #1998

Changes

With updates to the otel collector 0.104+, the collector now binds to localhost by default. The config now needs to explicitly allow access from outside the docker container.

Merge requirement checklist

• [ ] CONTRIBUTING guidelines followed
• [ ] Unit tests added/updated (if applicable)
• [ ] Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• [ ] Changes in public API reviewed (if applicable)