extend CI for all sample applications with every PR

[sallyom]

Need to add functional testing for:

(pending #247)

• [x] summarizer
• [x] codegen
• [x] rag
• [x] whisper model-server
• [ ] llamacpp-python-cuda
• [ ] llamacpp-python-vulkan
• [ ] audio-to-text

[sallyom]

I'm adding codegen, rag, & summarizer & combining tests into a common folder