[pull] develop from getsentry:develop

[pull]

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Summary by Sourcery

Update Express v5 tracing instrumentation to handle route naming more accurately, especially for routes with no explicit path

Enhancements:

• Improve route handling in Express v5 instrumentation to correctly manage routes with empty paths

Tests:

• Update test case to expect correct route name for non-existent routes

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Reviewer's Guide

This pull request refines route handling in the Express v5 tracing instrumentation. Empty or non-existent routes are now explicitly treated as undefined instead of defaulting to '/', leading to more accurate transaction naming and attribute reporting for such cases.

File-Level Changes

Change	Details	Files
Modified Express v5 instrumentation to handle empty routes as undefined instead of /.	Introduced actualRoute variable, which is set to undefined if the original route is empty. Updated SEMATTRS_HTTP_ROUTE attribute to use actualRoute. Updated rpcMetadata.route to use actualRoute.	packages/node/src/integrations/tracing/express-v5/instrumentation.ts
Updated integration tests to reflect changes in route handling for non-existent paths.	Changed the expected transaction name for a 404 test case from GET / to GET /does-not-exist. Removed the expectation for http.route to be / in the 404 test case, as it's now implicitly undefined and not set.	dev-packages/node-integration-tests/suites/express-v5/tracing/test.ts

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