chore: Upgrade vite-related dependencies

[jperals]

Description

• Upgrades vite, vitest, @vitest/coverage-v8 and @vitejs/plugin-react to latest available versions
• Updates unit test to use new MockInstance interface which replaced the now removed SpyInstance

Related links, issue #, if available: n/a

How has this been tested?

• Existing tests
• Downloaded and locally reviewed the generated screenshots

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.64%. Comparing base (2fbee71) to head (31e7dbf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #338      +/-   ##
==========================================
- Coverage   95.71%   93.64%   -2.08%     
==========================================
  Files          61       67       +6     
  Lines        4321     3115    -1206     
  Branches      670      669       -1     
==========================================
- Hits         4136     2917    -1219     
- Misses        185      194       +9     
- Partials        0        4       +4     

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