Fix issue with outputting "static" in GLSL (#1006)

This appears to be a regression introduced in #1001, and missed because none of our existing tests covered `static const` arrays on the GLSL/SPIR-V targets.

The basic problem is that we cannot output a `static const` definition in GLSL because `static` is a reserved word and not a keyword. Instead for GLSL we just want a `const` array. This change makes the emission of `static` for global-scope constants key on the target language for code generation, and only emit it for HLSL, C, and C++.

This change also adds a test case specifically for running Slang input that has a `static const` array on the Vulkan target.

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