C#: Fix SendToScriptDebugger crash

[RedworkDE]

• Fixes C# exception stacktraces are not shown when app is executed from editor command line #68662
• Fixes Fatal error. System.AccessViolationException: Attempted to read or write protected memory. #77343
• Fixes Editor crashes when replacing built C# dlls #77370 (at least the crash of it, I cannot reproduce the underlying exception)
• Fixes Tool Scripts cause editor crash and project corruption #72123

Such a stupid error, it was so close to working correctly.

(On x64:)
The native code returned a bool as a single byte in the al register, leaving the rest of the a register whatever garbage it was before, but the native to managed transition interpreted the return value as a 4 byte bool in eax, which was mostly filled with garbage and thus not 0 (false) as intended.
Somehow on dev build none of this matters and the engine just doesn't crash hiding the issue.

With this patch the return value is correctly interpreted as a single byte value on the C# side.

[akien-mga]

Makes sense to me.

[neikeq]

I'm thinking in the future we should make the internal calls source generator detect mistakes like this, or automatically do the conversion to godot_bool.

[akien-mga]

Thanks!

[YuriSizov]

Cherry-picked for 4.0.4. That's a big one, nice!