Fix request exception in WEB package

[harsimar]

This PR fixes the below exception:

Request is not available in this context Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Request is not available in this context
Source Error:
Line 17:         public static HttpRequest GetRequest(this HttpContext context) Line 18:         { Line 19:             return context?.Request; Line 20:         } Line 21:
Source File: C:\repos\ApplicationInsights-dotnet\WEB\Src\Web\Web\Implementation\HttpContextExtensions.cs    Line: 19

Encountered when one calls TrackDependency inside Application_Start method.

[Copilot]

Pull request overview

Fixes an HttpException ("Request is not available in this context") that occurred when telemetry was generated outside a request scope (e.g., TrackDependency in Application_Start). The GetRequest extension on HttpContext is hardened to catch this exception and return null, and all activity processors are updated to use the safe accessor.

Changes:

• Wrap HttpContext.Request access in HttpContextExtensions.GetRequest with a try/catch for HttpException, returning null instead.
• Update all activity processors (AccountIdActivityProcessor, AuthenticatedUserIdActivityProcessor, ClientIpHeaderActivityProcessor, SessionActivityProcessor, UserActivityProcessor) to call context.GetRequest() and short-circuit when null.
• Update CreateRequestNamePrivate to use the same safe accessor.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
WEB/Src/Web/Web/Implementation/HttpContextExtensions.cs	Hardens GetRequest against HttpException; updates docs; refactors CreateRequestNamePrivate to use it.
WEB/Src/Web/Web/AccountIdActivityProcessor.cs	Uses safe GetRequest() accessor in OnEnd.
WEB/Src/Web/Web/AuthenticatedUserIdActivityProcessor.cs	Uses safe GetRequest() accessor in OnEnd.
WEB/Src/Web/Web/ClientIpHeaderActivityProcessor.cs	Uses safe GetRequest() accessor; updates request reads to local variable.
WEB/Src/Web/Web/SessionActivityProcessor.cs	Uses safe GetRequest() accessor in OnEnd.
WEB/Src/Web/Web/UserActivityProcessor.cs	Uses safe GetRequest() accessor in OnEnd.

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