vulkan: vulkanoperation fixes
vulkan/operation: don't fail if extension isn't available
gst_vulkan_operation_add_dependency_frame() is a noop if the required extensions aren't available.
vulkan/operation: remove stored fences at the end
CC: @ystreet
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vulkan/operation: don't fail if extension isn't available
gst_vulkan_operation_add_dependency_frame() is a noop if the required extensions aren't available.
vulkan/operation: remove stored fences at the end
CC: @ystreet