Allow node templates names to use UUID

This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.

This still needs profiling.

Also curious if there's any security implication with this.

Rerolled #24 onto an MR against 11.x

There is one big issue though - UUIDs contain hyphens which is considered an invalid suggestion by our twig engine so we need to replace them with underscores.