[FEATURE] Add ability to stop a sample from running if not enough resources

[nmetulev]

Describe the bug

When app is open, a model is always loaded. Hence GPU/CPU is always in use. If user is using a large model, it would contribute to low performance of computer and memory leak. Need a way to eject the model when not using the playground.

To Reproduce

Steps to reproduce the behavior:

1. Download Phi3 medium
2. Try run generation sample
3. Have task manager open to monitor GPU usage
4. 16GB is barely enough and no way to eject the model to stop GPU usage

Expected behavior

A button to eject the model to free processors.

Originally created by @beth-panx