[Bug]: Security Alerts API - GET request to get supportedChains blocks the Send Flow until resolved

[seaona]

Describe the bug

Whenever we start a Send flow, there is a request send to the host security-alerts.api.cx.metamask.io to get the supportedChains. The problem is that the Send flow is blocked until this request is resolved (either success or failed).

Expected behavior

We shouldn't block the Send flow until this API request is resolved. If the API is slow, this impacts the overall user experience.
We might want to have an initial value for that array, so this is non blocking, and update it when we get the response?

Screenshots/Recordings

security-alerts-api-block.mp4

Steps to reproduce

1. Use a proxy to intercept requests (ie Burpsuite)
2. Start a Send flow
3. Intercep the request to security-alerts.api.cx.metamask.io
4. See send flow cannot be initiated until we have a response to this request

Error messages or log output

No response

Detection stage

During release testing

Version

12.7.0

Build type

None

Browser

Chrome

Operating system

Linux

Hardware wallet

No response

Additional context

No response

Severity

No response