[Bug]: "Smart Transactions" setting should be in "Security & Privaty" section.

### Describe the bug

In Settings > Advanced there is an option for "Smart Transactions". This is a privacy affecting setting as it changes who you send transaction data to. In this case your transaction is sent to relayers rather than your configured RPC node. This will associate your transaction with your IP address, along with any other fingerprinting included in HTTP headers.

This settings should be placed under "Security & Privacy" since it has an impact on privacy, and a privacy conscious user should be able to reliably protect their privacy by only adjusting settings in that section.

### Expected behavior

All privacy related settings are in the Security & Privacy section..

### Screenshots/Recordings

_No response_

### Steps to reproduce

1. Go to Settings > Advanced
2. Notice that Smart Transactions is an option there.
3. Go to Settings > Security & Privacy
4. Notice that Smart Transactions is not an option there.

### Error messages or log output

```shell

```

### Detection stage

In production (default)

### Version

12.9.3

### Build type

None

### Browser

Brave

### Operating system

Windows

### Hardware wallet

_No response_

### Additional context

Manual install of Firefox version (Manifest v2) of the extension in Brave, Not installed via the store.

### Severity

_No response_

Start by locating the Smart Transactions setting currently rendered under Settings > Advanced and compare the Security & Privacy settings section. Done means the option appears under Security & Privacy and no longer appears under Advanced; verify both locations in the extension UI.

Written by the indexing model from the issue text.