feat: allow resetting the nonce for a single wallet

[arcoraven]

PR-Codex overview

This PR focuses on refactoring the nonce management for backend wallets by replacing the deleteAllNonces function with deleteNoncesForBackendWallets, and introduces a new route resetBackendWalletNoncesRoute for resetting nonces via a POST request.

Detailed summary

• Deleted src/server/routes/backend-wallet/resetNonces.ts.
• Renamed and modified deleteAllNonces to deleteNoncesForBackendWallets for better specificity.
• Added resetBackendWalletNoncesRoute in src/server/routes/backend-wallet/reset-nonces.ts for handling nonce resets.
• Introduced request and response schemas for the new route.
• Implemented logic to delete and resync nonces for specified or all backend wallets.

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