Add log exporter test method

[cyrille-leclerc]

Add log exporter test method to enable testing the connectivity of OTel SDKs instantiated on Jenkins build agents.

On the Jenkins build agent screen in Jenkins, navigate to the Script console screen and execute the command

io.jenkins.plugins.opentelemetry.api.util.OpenTelemetryUtils.testLogRecordExporter()

The result looks like

Result: testLogRecordExporter(): result(success: truedone: true), OtlpGrpcLogRecordExporter{exporterName=otlp, type=log, endpoint=http://localhost:4317, endpointPath=/opentelemetry.proto.collector.logs.v1.LogsService/Export, timeoutNanos=30000000000, connectTimeoutNanos=10000000000, compressorEncoding=null, headers=Headers{User-Agent=OBFUSCATED}, memoryMode=IMMUTABLE_DATA}, TestLogRecordData{resource=Resource{schemaUrl=null, attributes={host.arch="aarch64", host.name="cyrille-le-clerc-macbook.local", jenkins.computer.name="jnlp_agent", jenkins.opentelemetry.plugin.version="3.999999-SNAPSHOT (private-830d1fd1-cyrilleleclerc)", jenkins.url="http://localhost:8080/jenkins/", jenkins.version="2.440.3", os.description="Mac OS X 14.6.1", os.type="darwin", process.command_line="/opt/homebrew/Cellar/openjdk@11/11.0.24/libexec/openjdk.jdk/Contents/Home/bin/java --add-opens=java.base/java.io=ALL-UNNAMED agent.jar -url http://localhost:8080/jenkins/ -secret e4fd75fdd833e03df45f85d2084e2898b09b03a29a59349dcfd7d6c66e849824 -name jnlp_agent -workDir ~/jenkins/agent-intellij", process.executable.path="/opt/homebrew/Cellar/openjdk@11/11.0.24/libexec/openjdk.jdk/Contents/Home/bin/java", process.pid=34012, process.runtime.description="Homebrew OpenJDK 64-Bit Server VM 11.0.24+0", process.runtime.name="OpenJDK Runtime Environment", process.runtime.version="11.0.24+0", service.instance.id="1adfda6bdc8e8b6dd676433c55b1386f", service.name="jenkins", service.namespace="jenkins", service.version="2.440.3", telemetry.sdk.language="java", telemetry.sdk.name="opentelemetry", telemetry.sdk.version="1.40.0"}}, instrumentationScopeInfo=InstrumentationScopeInfo{name=io.jenkins.opentelemetry.api, version=null, schemaUrl=null, attributes={}}, timestampEpochNanos=1724792031745884000, observedTimestampEpochNanos=0, spanContext=ImmutableSpanContext{traceId=00000000000000000000000000000000, spanId=0000000000000000, traceFlags=00, traceState=ArrayBasedTraceState{entries=[]}, remote=false, valid=false}, severity=INFO, severityText=INFO, body=StringBody{asString=Test log record}, attributes={}, totalAttributeCount=0} -

Testing done

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
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• Ensure you have provided tests - that demonstrates feature works or fixes the issue