Fix scalar to array conversion for tessellation factors (#7837)

* Fix scalar to array conversion for tessellation factors in GLSL legalization

Add scalar-to-array conversion support in adaptType() function to handle
cases where users declare scalar tessellation factors (e.g., float TessLevelInner)
but GLSL requires arrays (float[2] for gl_TessLevelInner). This prevents the
generation of BuiltinCast instructions that crash the SPIR-V emitter.

Fixes crash: "unimplemented: Unhandled local inst in spirv-emit: BuiltinCast"

- Add scalar-to-array case in slang-ir-glsl-legalize.cpp adaptType()
- Fill all array elements with the scalar value for tessellation factors
- Add test case for scalar tessellation factor conversion

Fixes #7000

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Apply review feedback fixes

- Change test directive to TEST:SIMPLE
- Use IRArrayType instead of IRArrayTypeBase
- Use MakeArrayFromElement for cleaner scalar-to-array conversion

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Fix type conversion in scalar-to-array tessellation factor conversion

Convert scalar value to array element type before creating array to handle
cases where scalar type differs from array element type (e.g., int to float[3]).

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Use CHECK-DAG for order-independent tessellation factor checks

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

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