Sentry.AspNetCore contains an extra slash in transaction name for /healthz when a base path is used

[SeanFeldman]

.NET 6.0.0
Sentry.AspNetCore 3.29.1

Steps to Reproduce

Using the code outlined in #1435 (comment), throw an exception in the health endpoint.

Expected Result

Transaction named GET api/healthz

Actual Result

Transaction named GET api//healthz (double slash)

[SeanFeldman]

The issue is likely caused by how the transaction name is built when there's a base path present in the HttpContextExtensions.NewRouteFormat extension method at

sentry-dotnet/src/Sentry.AspNetCore/Extensions/HttpContextExtensions.cs

Line 41 in e79cce2

builder.Append(context.Request.PathBase.Value?.TrimStart('/'))

.

When the route is added, it assumes the route doesn't start with a leading slash.

sentry-dotnet/src/Sentry.AspNetCore/Extensions/HttpContextExtensions.cs

Line 53 in e79cce2

builder.Append(routePattern);