[Test] Setup autotest infrastructure

[Fabricio-ESP]

Description

This PR adds the automated tests infrastructure of the EIM GUI.
The initial test only launches the application and checks the application is running and the version printed on the page footer.

2 Additional test worflow are added:
Express installation (single click test automation process)
Expert Installation (Step by step flow using basic settings)

TODO:
Setup CI workflow

Related

Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[github-actions]

Test Results

 6 files  12 suites   20s ⏱️
 5 tests  3 ✅ 0 💤 2 ❌
38 runs  34 ✅ 0 💤 4 ❌

For more details on these failures, see this check.

Results for commit 800c460.

♻️ This comment has been updated with latest results.

[Hahihula]

As an initial version of the tests LGTM. It would be nice to read the version from cargo.toml and not have it hardcoded, but that's nitpicking.
Also please squash the commits on merge time.