test(config): migrate normalize tests to vitest

[43081j]

This migrates the normalize tests to vitest.

As part of that, it drops omit.js since it can't load without some funkiness in vitest and is redundant anyway.

The snapshots were diffed locally and appear to be equal (via a script i had claude make).

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: bd028647-a7aa-4528-a9b1-a5ab0222452b

📥 Commits

Reviewing files that changed from the base of the PR and between 9a7f024 and 8538d2d.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (1)

• packages/config/package.json

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• netlify/blueprints (manual)

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/config/package.json

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Expanded configuration normalization coverage for commands, defaults, functions, plugins, included files, and context-specific settings.
  • Added Vitest coverage alongside existing test suites, with improved test discovery, isolation, and timeout handling.
  • Extended linting support across additional test file patterns.
• Refactor
  • Consolidated normalization tests into the newer test structure while preserving snapshot-based validation.

Walkthrough

The PR adds Vitest support to packages/config, updates test and CI scripts, and adds Vitest configuration. It expands ESLint suppression globs for .test.js files. It adds 160 lines of normalization snapshot tests covering commands, defaults, origins, functions, included files, and plugins.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary change: migrating the config normalize tests to Vitest.
Description check	✅ Passed	The description explains the migration, dependency removal, snapshot validation, and checklist status; the missing issue link is non-critical.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

e18e dependency analysis

No dependency warnings found.

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commit: 8538d2d

[serhalp]

LGTM, thanks! Just one request inline please 🙏🏼

[43081j]

@serhalp i have split out #7168 which needs to land first, then ill rebase this (seems i can't use github stacked PRs for already open PRs)