fix: Small improvement to OTLP Exporter logs

[cijothomas]

Small improvements I found useful from OTLP testing.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 56 lines in your changes missing coverage. Please review.

Project coverage is 80.9%. Comparing base (167c946) to head (91c576c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-otlp/src/exporter/http/metrics.rs	0.0%	18 Missing ⚠️
opentelemetry-otlp/src/exporter/tonic/logs.rs	0.0%	10 Missing ⚠️
opentelemetry-otlp/src/exporter/tonic/metrics.rs	0.0%	10 Missing ⚠️
opentelemetry-otlp/src/exporter/tonic/trace.rs	0.0%	10 Missing ⚠️
opentelemetry-otlp/src/exporter/http/logs.rs	0.0%	4 Missing ⚠️
opentelemetry-otlp/src/exporter/http/trace.rs	0.0%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3007     +/-   ##
=======================================
- Coverage   81.0%   80.9%   -0.2%     
=======================================
  Files        126     126             
  Lines      24755   24787     +32     
=======================================
  Hits       20072   20072             
- Misses      4683    4715     +32     

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[utpilla]

It would be nice to do something similar to what you have for the Http clients which is using the error/status code and message/response:

Suggested change

	let error = format!("export error: {:?}", e);
	let error = format!(
	"OpenTelemetry logs export failed. Status Code: {}, Message: {:?}",
	e.code(),
	e.message()
	);