Document IsFromUnhandledException/IsFromTerminalException API (.NET)

[jamescrosswell]

DESCRIBE YOUR PR

Documents the new SentryEvent.IsFromUnhandledException() and SentryEvent.IsFromTerminalException() extension methods (added in getsentry/sentry-dotnet#5177) so users can find them where they're most likely to be used — the before-send filtering docs.

• Adds a "Filtering by Unhandled or Terminal Exceptions" subsection under Using before-send in the .NET filtering docs
• Explains the difference between unhandled and terminal exceptions
• Provides C# and F# examples for filtering handled exceptions while always sending unhandled ones

Closes getsentry/sentry-dotnet#5348

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[Flash0ver]

One nit-picky suggestion/question.
Merge after release of sentry-dotnet v6.7.0.

[Flash0ver]

TIL: F# has no implicit usings / opens

[Flash0ver]

question/suggestion: consistency of delegate parameter names with example above

Here, the F# parameters sentryEvent hint are consistent with the C# code (sentryEvent, hint).

But in the example above: "Using BeforeSend", the C# code also uses (sentryEvent, hint) (so we are consistent there) ... but the F# code uses fun event hint -> (where we are not consistent).

I believe using "sentryEvent" here is OK, but perhaps we might want to rename the existing F# sample to "sentryEvent" rather than just "event", too. Considering https://learn.microsoft.com/dotnet/fsharp/language-reference/keyword-reference which documents that event is "a token that is reserved as keyword for future expansion of F#".

But to be fair ... the inconsistency of sentryEvent vs the above event is definitely nit-picky ... and not directly related to THIS changeset.