[PROTECT-3455] Remove feature_recover_upsell_redirection feature flag from codebase

[jiyuzhuang]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • The feature_recover_upsell_redirection feature flag has been removed, now the new onboarding flow and redirections after onboarding will always take place.

📝 Description

• The feature_recover_upsell_redirection feature flag has been removed, now the new onboarding flow and redirections after onboarding will always take place.
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• The BackupStep components for both LLD and LLM are not used in any other place, so they have been removed.

❓ Context

• JIRA or GitHub link: PROTECT-3455

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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[ofreyssinet-ledger]

lgtm 👍 please make sure you/QA tests the sync onboarding on LLM+LLD for both seeded & unseeded devices 🙏