[AzureMonitorExporter] minor test improvements. add additional logging to TelemetryItems tests

[TimothyMothra]

This PR adds additional console logging to help inspect TelemetryItems

Still having some intermediate test failures.
I need this additional logging to identify the origin of the extra Activity TelemetryItems that are being captured by our test.

Changes

• move TelemetryItemOutputHelper from "Integration.Tests" project to "CommonTestFramework"
  This makes this class available to all tests.
• add logging to every "TelemetryItemValidation" test.
• assert SpanId to Trace tests.
• change LogExporterForTest to use SimpleLogRecordExportProcessor
• mitigate test failure by using .First() instead of .Single().
  This should prevent the random error from blocking someone else in the Azure repo.
  I'll continue investigating this on a new branch.

Visual Studio Screenshot

[azure-sdk]

API change check

API changes are not detected in this pull request.

[TimothyMothra]

Captured the failure.
It appears that the test created two duplicate Activities: Name, TraceId, and SpanId are identical.

 Failed Azure.Monitor.OpenTelemetry.Exporter.Tests.E2ETelemetryItemValidation.TracesTests.VerifyLogWithinActivity(logLevel: Trace, expectedSeverityLevel: "Verbose") [1 s]
  Error Message:
   System.InvalidOperationException : Sequence contains more than one element
  Stack Trace:
     at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at Azure.Monitor.OpenTelemetry.Exporter.Tests.E2ETelemetryItemValidation.TracesTests.VerifyLogWithinActivity(LogLevel logLevel, String expectedSeverityLevel) in D:\a\_work\1\s\sdk\monitor\Azure.Monitor.OpenTelemetry.Exporter\tests\Azure.Monitor.OpenTelemetry.Exporter.Tests\E2ETelemetryItemValidation\TracesTests.cs:line 185
  Standard Output Messages:
 --------------------------------
 Name: RemoteDependency
 Tags: 4
 	ai.operation.id: 13edd4f471789fa99d168090412fbf40
 	ai.cloud.role: unknown_service:testhost.net461
 	ai.cloud.roleInstance: f9ee0c6bc000019
 	ai.internal.sdkVersion: dotnet4.8.4515.0:otel1.3.1:ext1.0.0-alpha.20220930.7
 
BaseData: RemoteDependencyData
 Name: TestActivity VerifyLogWithinActivity Trace
 Id: 242d683d95b1297e
 Properties: 0
 --------------------------------
 Name: RemoteDependency
 Tags: 4
 	ai.operation.id: 13edd4f471789fa99d168090412fbf40
 	ai.cloud.role: unknown_service:testhost.net461
 	ai.cloud.roleInstance: f9ee0c6bc000019
 	ai.internal.sdkVersion: dotnet4.8.4515.0:otel1.3.1:ext1.0.0-alpha.20220930.7
 
BaseData: RemoteDependencyData
 Name: TestActivity VerifyLogWithinActivity Trace
 Id: 242d683d95b1297e
 Properties: 0