Refactored API sample hpp_texture_loading.

[asuessenbach]

Description

Includes minor adjustments to the API samples hpp_compute_nbody, hpp_dynamic_uniform_buffers, hpp_hdr, hpp_hello_triangle, hpp_hlsl_shaders, hpp_instancing, hpp_separate_image_sampler, and hpp_terrain_tessellation.

Build tested on Win10 with VS2022. Run tested on Win10 with NVidia GPU.

General Checklist:

Please ensure the following points are checked:

• My code follows the coding style
• I have reviewed file licenses
• I have commented any added functions (in line with Doxygen)
• I have commented any code that could be hard to understand
• My changes do not add any new compiler warnings
• My changes do not add any new validation layer errors or warnings
• I have used existing framework/helper functions where possible
• My changes do not add any regressions
• I have tested every sample to ensure everything runs correctly
• This PR describes the scope and expected impact of the changes I am making

Note: The Samples CI runs a number of checks including:

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Sample Checklist

If your PR contains a new or modified sample, these further checks must be carried out in addition to the General Checklist:

• I have tested the sample on at least one compliant Vulkan implementation
• If the sample is vendor-specific, I have tagged it appropriately
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• Any dependent assets have been merged and published in downstream modules
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• For new samples, I have added a tutorial README.md file to guide users through what they need to know to implement code using this feature. For example, see conditional_rendering