Fix VisualShaderNodeVaryingGetter expanded ports adding ".x" to shader

When VisualShaderNodeVaryingGetter type was Vector2/Vector3/Vector4, expanding the output ports and connecting an individual value to a scalar input would add ".x" to the assignment in the generated shader.  This was due to `VisualShaderNodeVarying::get_port_type` ignoring the port number, and always returning the associated vector type.  Added checks for `p_port == 0` to return either the vector type, or scalar for expanded ports, matching similar logic in other nodes, like `VisualShaderNodeColorConstant::get_output_port_type`.

Fixes #92832

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