Add ApplicationVersionResourceDetector for service.version

[rajkumar-rangaraj]

Fix Issue #3111 .

Changes

Introduced ApplicationVersionResourceDetector to set the application version as the service.version resource attribute in OpenTelemetry. Registered the detector in both ASP.NET Core and WorkerService ApplicationInsights extension flows. Added unit tests to verify correct behavior for valid, null, and empty version values.

Checklist

• I ran Unit Tests locally.
• CHANGELOG.md updated with one line description of the fix, and a link to the original issue if available.

[Copilot]

Pull request overview

This PR addresses Issue #3111 by ensuring ApplicationInsightsServiceOptions.ApplicationVersion is propagated into OpenTelemetry as the service.version resource attribute, so the application version is no longer ignored in v3.

Changes:

• Introduces ApplicationVersionResourceDetector to emit service.version based on ApplicationInsightsServiceOptions.ApplicationVersion.
• Registers the detector in both ASP.NET Core and WorkerService OpenTelemetry resource configuration flows.
• Adds unit tests validating detector output for valid, null, and empty version values.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
NETCORE/test/Shared/ConfigurationTests.cs	Adds unit tests for the new resource detector behavior.
NETCORE/src/Shared/Shared.projitems	Includes the new detector source file in the shared compilation items.
NETCORE/src/Shared/ApplicationVersionResourceDetector.cs	Implements a resource detector that sets service.version from ApplicationVersion.
NETCORE/src/Microsoft.ApplicationInsights.WorkerService/ApplicationInsightsExtensions.cs	Registers the new detector in the WorkerService OpenTelemetry resource pipeline.
NETCORE/src/Microsoft.ApplicationInsights.AspNetCore/Extensions/ApplicationInsightsExtensions.cs	Registers the new detector in the ASP.NET Core OpenTelemetry resource pipeline.

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[harsimar]

1. What happens if the customer does not explicitly set the version?
2. Please double check in the breaking changes & migration guidance docs that any references to ApplicationVersion or ComponentVersion are up to date with this change.

[rajkumar-rangaraj]

What happens if the customer does not explicitly set the version?

https://github.com/microsoft/ApplicationInsights-dotnet/blob/main/NETCORE/src/Shared/Extensions/ApplicationInsightsServiceOptions.cs#L48

We have default set from the code using public string ApplicationVersion { get; set; } = Assembly.GetEntryAssembly()?.GetName().Version.ToString(); value of it will be 1.0.0.

Please double check in the breaking changes & migration guidance docs that any references to ApplicationVersion or ComponentVersion are up to date with this change.

Will check this out.

[rajkumar-rangaraj]

Please double check in the breaking changes & migration guidance docs that any references to ApplicationVersion or ComponentVersion are up to date with this change.

A minor adjustment is required for ComponentVersion from the DI perspective. However, we should plan to address it after we resolve the TelemetryContext issue.