Description

Commit 8d85609 (#6250) added HTTP service support to otel_logs_source but introduced regressions that break existing users:

1. NPE on startup — configureHttpService() was called unconditionally, causing String.replace() to throw on a null http_path for any user who only configured a gRPC path.
2. ACM certificate TLS silently broken — The SSL setup branch dropped the useAcmCertForSSL() check, so users relying on ACM-issued certificates would start without TLS.
3. HTTP health check registered unconditionally — The old behavior gated the HTTP /health endpoint on enableUnframedRequests() being true; the new code registered it for all configs regardless.
4. Auth provider split — The server-level HTTP decorator was loaded as an ArmeriaHttpAuthenticationProvider while the gRPC interceptor used a separate GrpcAuthenticationProvider, potentially
   resolving to different plugin implementations. The original code used a single GrpcAuthenticationProvider for both.

All changes are confined to OTelLogsSource.java:

• Gate configureHttpService() on http_path being non-null — making HTTP service opt-in, consistent with how gRPC path works
• Restore || useAcmCertForSSL() in the SSL condition
• Restore the HTTP health check gate: registered only when enableUnframedRequests() or http_path is set (the latter ensures the new HTTP service also gets a health endpoint)
• Hoist GrpcAuthenticationProvider creation into createServer, apply its getHttpAuthenticationService() as the server-level decorator, and pass the same instance into configureGrpcService —
  removing the split-provider pattern and the now-dead createHttpAuthentication() helper

Issues Resolved

N/A

Check List

• New functionality includes testing.
• New functionality has a documentation issue. Please link to it in this PR.
  • New functionality has javadoc added
• Commits are signed with a real name per the DCO

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