Combined native-engine GL fixes (re-enables 10 validation tests)#1752

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bkaradzic-microsoft:native-combined-gl-fixes

Commits on Jun 18, 2026

Re-enable blur-cube-with-the-effect-renderer validation test

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NativeEngine: load single-file .dds/.ktx/.ktx2 cubemaps + spherical harmonics

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Add native cube render target support (re-enables 2 shadow-with-instances tests)

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NativeEngine: implement updateTextureData (re-enables Test updateTextureData)

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