Pass actual exception as inner exception in ThrowsException assertions

[Copilot]

Changed Assert.Throws* methods to pass the actual thrown exception as InnerException of AssertFailedException instead of including it in the error message string.

Changes:

• Added ThrowAssertFailed(string, string?, Exception?) overload to accept inner exception
• Reverted WrongExceptionThrown message format to remove {3} placeholder for exception details
• Updated IsThrowsFailing and IsThrowsAsyncFailingAsync to pass exception to new overload
• Updated test assertions to verify InnerException property instead of message content

Before:

// Exception details embedded in message string
throw new AssertFailedException(
    "Assert.Throws failed. Expected type:<ArgumentException>. Actual type:<Exception>. Actual exception: System.Exception: ...");

After:

// Exception available as InnerException
throw new AssertFailedException(
    "Assert.Throws failed. Expected type:<ArgumentException>. Actual type:<Exception>.",
    actualException);

Exception details remain accessible via AssertFailedException.InnerException while keeping the assertion message concise.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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