[WIP]: DONOT MERGE Fix invalid quest definition URLs

[susrisha]

Summary

• validate external Long Form Quest URLs as JSON matching the configured quest schema before saving
• keep Workspace Settings usable when an existing invalid quest configuration fails to load
• add regression coverage for both cases

Validation

• npx eslint util/schema.ts components/settings/panel/Apps.vue test/e2e/settings.spec.ts
• npm run typecheck
• npm run test:e2e -- test/e2e/settings.spec.ts --workers=1

Fixes #3644

[coderabbitai]

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 0e221318-bd63-4464-b448-10646f3d2f55

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