Fix avoidable exception when data length is too long

[se006]

Fix #713
Fix #1243

Data lengths that are both longer than int.MaxValue and data bytes are now ignored and do not throw an exception.

This would come up when connecting to a Tectia SFTP server running on a mainframe.

Credit to @edmlin for the fix. This is for issue #713

[IgorMilavec]

You should change/remove test Load_ShouldThrowNotSupportedExceptionWhenDataLengthIsGreaterThanInt32MaxValue for this PR to pass.

[se006]

I have removed the unit test as I cannot think of a way to enter into the middle condition,

 else if (dataLength > int.MaxValue)
            {
                throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, "Data longer than {0} is not supported.", int.MaxValue));
            }

Perhaps this condition should be removed entirely.

[IgorMilavec]

With the current implementation of SshData I believe you cannot test this case.
This exception provides a more explicit error information than the OverflowException that would happen anyway, and should stay in the code IMO.

[IgorMilavec]

@se006 can you please edit the PR description (first comment) to include text "Fix #713" so this PR will be linked to the issue? Tnx!

[se006]

Fix #713 added to first comment as requested

[WojciechNagorski]

LGTM!
I wish there was a test, but I know it will be difficult.

[WojciechNagorski]

The 2023.0.1 version has been released to Nuget: https://www.nuget.org/packages/SSH.NET/2023.0.1