No good VU for VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS

[spencer-lunarg]

When using VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS in a renderpass the only valid command is vkCmdExecuteCommands until calling vkCmdNextSubpass or vkCmdEndRenderPass (this is what the spec says)

The issue currently Validation will end up reporting it in something like

[spencer-lunarg]

(From Working Group meeting 9/3/2025) Decided we really don't want to generate yet-another-vu for every command, and decided best to make a "single central" VU somewhere so they all point at it

We may need a new state, like "secondary renderpass", and then the "must be in the recording state" would be fine and VVL would say "you're in the secondary renderpass state"