[GR-60094] Native Image Public Demos Status Review and Refactoring. Part 1

[olyagpl]

The goal is to sort the demos by categories (Native Image, referenced from blog posts, archived, microservices, etc.)
In this PR we:

1. Create a subfolder /native-image/ and move some Native Image demos there (these demos correspond to the guides at https://www.graalvm.org/latest/guides/)
2. Add new demos that were missing (some Native Image guides examples were missing or these guides have been just recently added)
3. Clean demos README, they should point to the corresponding guide at https://www.graalvm.org/latest/guides/ instead of maintaining the two versions
4. Add run.sh scripts for each demo for users convenience and for general consistency
5. Sort the workflow files by placing those demos files' into a subfolder .github/workflows/native-image

[shaunsmith]

Looks good, based on our Zoom review.