chore(als): replace mocha with vitest for 'task als'

[ssbarnea]

Related: AAP-58298
Related: #2329

---

name: Pull request
about: Describe the proposed change

Before review

• All tests are passing
• Description mentions issue via
  (fixes|closes|related): #<issue_number|AAP-number>
• PR is kept as draft until all checks above are met

Review checklist

• Size of change. If it can be split into smaller PRs, please do so.
• Docs checks:
  • heading titles are short and render without wrapping in sidebar
  • code blocks and diagrams render correctly in dark/light mode
  • images and videos are not blurry, small in size and use appropriate
    format such as png, svg, webp, mp4 (not gif).
  • Less is more, no boilerplate language. Feel free to use AI to help with
    this and with correct grammar.

[alisonlhart]

In logs, detecting multiple versions of ansible-lint in ALS tests.
Snippet:

ansible-lint 25.12.0 using ansible-core:2.20.0 ansible-compat:25.12.0 ruamel-yaml:0.18.16 ruamel-yaml-clib:0.2.12
stdout | test/providers/definitionProvider.test.ts
Detected: ansible-lint 25.11.1 using ansible-core:2.20.0 ansible-compat:25.11.0 ruamel-yaml:0.18.16 ruamel-yaml-