docs(dotnet): document PreferTransactionNameProvider option

[jamescrosswell]

DESCRIBE YOUR PR

Documents the new PreferTransactionNameProvider option added to the ASP.NET Core integration in getsentry/sentry-dotnet#5159, along with the existing TransactionNameProvider option it modifies (which was previously undocumented).

Both are added to the ASP.NET Core section of the .NET Configuration Options page.

• Document TransactionNameProvider (callback used to name transactions for requests that don't resolve to a route template)
• Document PreferTransactionNameProvider (bool, default false) — controls whether the provider runs on every request or only as a route-resolution fallback

Ref: getsentry/sentry-dotnet#5349

Note for reviewers: availableSince is set to 6.7.0 (the next unreleased minor at time of writing). Assumes this matches the actual release that ships getsentry/sentry-dotnet#5159.

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Project	Deployment	Actions	Updated (UTC)
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