test: Implement extension installation and basic extension handling test scenario

[amisskii]

What does this PR do?

This PR adds a test scenario for the minikube extension

What issues does this PR fix or reference?

https://github.com/containers/podman-desktop-extension-minikube/issues/137

How to test this PR?

• Clone the podman-desktop repo
• cd to podman-desktop folder
• Execute pnpm install
• Execute pnpm build
• Set environment variable executing: export PODMAN_DESKTOP_ARGS="/path/to/podman-desktop"
• Clone the podman-desktop-extension-minikube repo
• cd to podman-desktop-extension-minikube folder
• Execute pnpm install
• Execute pnpm test:e2e

[ScrewTSW]

A lot of your files are missing an empty line at the end of the file :D also, prcheck is failing (lint)

[axel7083]

Need rebase

[odockal]

Otherwise it is good. I have tested it locally.