♻️ Remove Ember test app ESLint

[dependabot]

Why

The Ember test app is a private SDK fixture, not the repo linting source of truth. Keeping ESLint there created a separate dependency stream, and the ESLint 10 update was incompatible with the current Babel parser peer range.

What changed

• Removed the Ember test app ESLint scripts.
• Dropped the ESLint-only dependencies from the fixture package.
• Deleted the fixture ESLint flat config.
• Regenerated the pnpm lockfile without that direct ESLint stack.

Validation

• CI=true pnpm install --frozen-lockfile
• pnpm --filter test-ember-app run lint
• pnpm --filter test-ember-app run build
• pnpm run lint
• pnpm run build
• pnpm peers check
• pnpm run test:types

[vizzly-testing]

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_{dependabot/npm_and_yarn/major-dependencies-095e62894c · b2609098}