fix(validator): skip deleted YAMLs in PR diff

[nabeelio]

Summary

• Validator was including deleted YAML paths in its check list and crashing with ENOENT when runPackageChecks tried to read the (now missing) file.
• Fix: git diff --diff-filter=ACMRT so deleted (D) entries never reach the checker. Renamed/copied entries already surface their new path under these letters.
• Refactor changedYamlFiles into a pure filterPackageYamlPaths helper so the path filter is unit-testable without a git repo. Gate main() on direct execution so the test file can import the helper.

Test plan

• New scripts/tests/changed-yaml-files.test.ts covers added/modified/deleted/renamed cases (5 tests).
• npm test now reports 107/107 passing (was 102/102).
• Validator on this PR (which only touches scripts/) should be a no-op since it changes no YAMLs.

Caught while exercising task 12.7 of bootstrap-addon-registry \u2014 the smoke-test fixture removal PR #4.

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⚙️ Run configuration

Configuration used: Organization UI

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Plan: Free

Run ID: a45d5438-3a6f-4198-8fc7-e18718086d0d

📥 Commits

Reviewing files that changed from the base of the PR and between 186fb37 and 70eacf2.

📒 Files selected for processing (2)

• scripts/tests/changed-yaml-files.test.ts
• scripts/validate.ts

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