fix: update AppOnboard skill and test files

[vaibbavis]

Description

Checklist

• Tests pass locally (cd tests && npm test)
• If modifying skill descriptions: verified routing correctness with integration tests (npm run test:skills:integration -- <skill>)
• If modifying skill USE FOR / DO NOT USE FOR / PREFER OVER clauses: confirmed no routing regressions for competing skills

Related Issues

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[tmeschter]

In case this hasn't been brought up before: only the top-level SKILL.md files are actually considered skills; this will only be treated as a reference file. There's no particular need to organize this like a skill.

Unlike the top-level SKILL.md files, the frontmatter will be visible to the LM when it reads this file, and it may potentially be confusing to the LM.

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[JasonYeMSFT]

What are the .copilot-azure/sessions folders for? I don't see the tests using the fixture files.

[JasonYeMSFT]

Please don't write adhoc output to the source code. I supposed that's where the session folders come from in the commit?