[release/8.0.1xx-xcode15.1] [Blocks] Remove a block callback validation that's apparently too eager.

[vs-mobiletools-engineering-service2]

The validation verifies that the function pointer for a block callback is the same the return value from the method's MethodInfo.MethodHandle.GetFunctionPointer() method.

In actual code, it's equivalent to validating that the following always prints "Equal: true":

[UnmanagedCallersOnly]
public static void Invoke () {}

static void Test ()
{
    delegate* unmanaged<void> fptr1 = &Invoke;
    IntPtr fptr2 = GetType ().GetMethod ("Invoke").MethodHandle.GetFunctionPointer ();
    Console.WriteLine ($"fptr1: 0x{((IntPtr) fptr1).ToString ("x")}");
    Console.WriteLine ($"fptr2: 0x{fptr2.ToString ("x")}");
    Console.WriteLine ($"Equal: ((IntPtr) fptr1) == fptr2}"); // prints "Equal: true" for me
}

However, this isn't documented, and some feedback indicates it's certainly not a valid assumption for CoreCLR:

https://discord.com/channels/732297728826277939/732582981163548703/1242473425759633488

And there's also a customer running into this validation, apparently withou cause: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2054534

So just remove it.

Backport of #20625

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NET (empty diffs)

* ~iOS~: (empty diff detected) * ~tvOS~: (empty diff detected) * ~MacCatalyst~: (empty diff detected) * ~macOS~: (empty diff detected)

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.NET (No breaking changes)

* iOS: [vsdrops](https://vsdrop.corp.microsoft.com/file/v1/xamarin-macios/detected-changes/20240607.8/9694070-1/;/stable-api-comparison/diff/dotnet/Microsoft.iOS.Ref/ref/net8.0/Microsoft.iOS.html) [gist](https://gist.github.com/vs-mobiletools-engineering-service2/2c23e7532cd54e66dedbbc42edfb4731) (No breaking changes) * tvOS: [vsdrops](https://vsdrop.corp.microsoft.com/file/v1/xamarin-macios/detected-changes/20240607.8/9694070-1/;/stable-api-comparison/diff/dotnet/Microsoft.tvOS.Ref/ref/net8.0/Microsoft.tvOS.html) [gist](https://gist.github.com/vs-mobiletools-engineering-service2/7075858c1706bf6cbd3429b30ce30401) (No breaking changes) * MacCatalyst: [vsdrops](https://vsdrop.corp.microsoft.com/file/v1/xamarin-macios/detected-changes/20240607.8/9694070-1/;/stable-api-comparison/diff/dotnet/Microsoft.MacCatalyst.Ref/ref/net8.0/Microsoft.MacCatalyst.html) [gist](https://gist.github.com/vs-mobiletools-engineering-service2/900ac234379a549dbdc9e32acee5b064) (No breaking changes) * macOS: [vsdrops](https://vsdrop.corp.microsoft.com/file/v1/xamarin-macios/detected-changes/20240607.8/9694070-1/;/stable-api-comparison/diff/dotnet/Microsoft.macOS.Ref/ref/net8.0/Microsoft.macOS.html) [gist](https://gist.github.com/vs-mobiletools-engineering-service2/64428579592ed854bf239226ec7cd178) (No breaking changes) * Microsoft.iOS vs Microsoft.MacCatalyst: [vsdrops](https://vsdrop.corp.microsoft.com/file/v1/xamarin-macios/detected-changes/20240607.8/9694070-1/;/stable-api-comparison/diff/dotnet/iOS-MacCatalyst-diff/Microsoft.iOS.Ref/ref/net8.0/Microsoft.iOS.MacCatalyst.html) [gist](https://gist.github.com/vs-mobiletools-engineering-service2/daf86c60bab4d07f6eabb13591adb08b)

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