Allow dynamic_blending sample to work in more cases

[gary-sweet]

Description

Allow dynamic_blending sample to work on more hardware.
Feature support is checked and functionality reduced where applicable rather than just not running.
This now runs on my hardware (which doesn't support dynamic advanced blending changes).

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:

• I have updated the header Copyright to reflect the current year (CI build will fail if Copyright is out of date)
• My changes build on Windows, Linux, macOS and Android. (Tested only on Linux)

[asuessenbach]

I don't know if that's a valid test, but when I force eds_feature_support.extendedDynamicState3ColorWriteMask to be VK_FALSE (and keep the other flags on VK_TRUE), I get this validation layer error in build_command_buffer_for_plane:
Validation Error: [ VUID-vkCmdSetColorWriteMaskEXT-None-08540 ] Object 0: handle = 0x21a0ed66450, type = VK_OBJECT_TYPE_COMMAND_BUFFER; | MessageID = 0x4adab21f | vkCmdSetColorWriteMaskEXT(): extendedDynamicState3ColorWriteMask or shaderObject feature is not enabled. The Vulkan spec states: Either the extendedDynamicState3ColorWriteMask feature or the shaderObject feature or both must be enabled (https://vulkan.lunarg.com/doc/view/1.3.250.1/windows/1.3-extensions/vkspec.html#VUID-vkCmdSetColorWriteMaskEXT-None-08540)

[gary-sweet]

Good catch. I've added the missing guard around that now.