Fix how versions are handled in the test suite

https://github.com/KhronosGroup/Vulkan-ValidationLayers/commit/6db385a7ea2c85d384df3e9ccff06729f71b22e9#diff-eefbaf049195ad7b10928b277b434137d20dbbd7654d1d6bc278f689b8a5a612R318

changed how the tests handled versions, previously one could write a test case that requires descriptor indexing to work with either core or extension as follows:
```
SetTargetApiVersion(VK_API_VERSION_1_3);
AddOptionalExtensions(VK_EXT_DESCRIPTOR_INDEXING_EXTENSION_NAME);
AddRequiredFeature(vkt::Feature::descriptorIndexing);
```

but now we have turned the `SetTargetApiVersion` into "require at least this version" syntax instead of using the old `DeviceValidationVersion` API

This will likely reflect on the test coverage the `min_core.json` profile that is being skipped

Need to have a better system to allow a larger test coverage with regards to versions