Remove unused OTel Logging Exporter dependency

[ciscoo]

https://github.com/micrometer-metrics/tracing/blob/94d1143ab9b18db09166142733d8e3427952f79d/micrometer-tracing-bridges/micrometer-tracing-bridge-otel/build.gradle#L16C32-L16C62

Per the README:

This exporter is being deprecated in favour of the debug exporter. It will be removed in September 2024.

[shakuzen]

Thank you for bringing this to our attention. I'm not sure if that dependency is being used currently. I tried removing it on main and the build still passes. @marcingrzejszczak or @jonatan-ivanov do you know?

[marcingrzejszczak]

Hmm I don't recall that being used.

[jonatan-ivanov]

I think we might discuss about two things here:

1. io.opentelemetry:opentelemetry-exporter-logging (written in java, part of the OTel Java SDK, Maven Central, source)
2. Logging exporter (written in Go, part of the OTel collector, source)

Deprecating the collector module (#2) should have no effect on Micrometer Tracing, I guess @ciscoo meant the dependency (#1) but found the wrong deprecation note, the dependency should be stable and not deprecated.

Though that dependency seems unused as @shakuzen found out, I think it was only added for testing/troubleshooting/development purposes (with the first PR) and we forgot to remove.
I think we should remove it. @ciscoo Thank you for bringing this to our attention!