Fix inconsistent exception logging patterns and add guidance

[VamshikrishnaMonagari]

Category A : Remove redundant e.getMessage() where exception is already passed as the Throwable parameter:

• GrpcExporter.java
• HttpExporter.java
• JaegerRemoteSampler.java (also fix stale FINEST log to pass exception as Throwable instead of concatenating)

Category B : Pass exception as Throwable instead of stringifying via getMessage(), so logging frameworks can render full stack traces:

• AutoConfiguredOpenTelemetrySdkBuilder.java
• DeclarativeConfiguration.java
• TracerShim.java
• SdkDoubleHistogram.java
• SdkLongHistogram.java

Add best practice guidance to CONTRIBUTING.md recommending the use of dedicated logger overloads that accept a Throwable parameter.

Resolves #8228

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.27%. Comparing base (f674cdd) to head (4b8589c).

Files with missing lines	Patch %	Lines
...re/declarativeconfig/DeclarativeConfiguration.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8231   +/-   ##
=========================================
  Coverage     90.27%   90.27%           
+ Complexity     7695     7694    -1     
=========================================
  Files           850      850           
  Lines         23213    23207    -6     
  Branches       2356     2356           
=========================================
- Hits          20955    20951    -4     
+ Misses         1531     1529    -2     
  Partials        727      727           

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[jack-berg]

Sorry for the delayed review. I've reworked the CONTRIBUTING.md and introduced a knowledge base at https://github.com/open-telemetry/opentelemetry-java/tree/main/docs/knowledge

Can you merge main and include a section about this guidance in https://github.com/open-telemetry/opentelemetry-java/blob/main/docs/knowledge/general-patterns.md? Thanks!

[VamshikrishnaMonagari]

Sorry for the delayed review. I've reworked the CONTRIBUTING.md and introduced a knowledge base at https://github.com/open-telemetry/opentelemetry-java/tree/main/docs/knowledge

Can you merge main and include a section about this guidance in https://github.com/open-telemetry/opentelemetry-java/blob/main/docs/knowledge/general-patterns.md? Thanks!

Thanks for the heads up, @jack-berg ! I've rebased on main and moved the logging guidance over to the Logging section in docs/knowledge/general-patterns.md. The CONTRIBUTING.md is left untouched now. Let me know if the placement looks good.

[jack-berg]

Thanks!

[VamshikrishnaMonagari]

@jack-berg Thanks for the approval! Could you go ahead and merge this when you get a chance? I don't have merge access on the repo.

[jack-berg]

Yup - was waiting for a passing build after resolving a merge conflict

[otelbot]

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