fix(config): remove stale OTLP config after squash merges

The OTLP and APM/trace cutovers removed all consumers of common/otlp/config.rs, but squash-merging the spike PRs left the module declared. Remove it to fix the resulting dead-code errors from the PR-5 merge fallout.

Merge fallout from #1989 and #1991.

Author: webern

lib/saluki-components/src/common/otlp/config.rs

@@ -3,7 +3,6 @@
 //! Provides shared server setup code for both OTLP receiver (proxy mode) and OTLP source (translation mode).
 
 pub mod attributes;
-pub mod config;
 pub mod origin;
 pub mod semantics;
 pub mod traces;