chore: lower c2 blocklist fetch interval (#4850)

## Explanation

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The current C2 domain blocklist fetch interval is set to 15 minutes.
After discussing with Samczsun, we determined it's best to lower this
interval, as drainers have started switching C2s more quickly since C2
detection was rolled out.

This update only affects the fetch interval for the C2 blocklist.

## References

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## Changelog

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### @metamask/phishing-controller

- **CHANGED**: Lowered the C2_DOMAIN_BLOCKLIST_REFRESH_INTERVAL from 15
minutes to 5 minutes.

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [x] I've highlighted breaking changes using the "BREAKING" category
above as appropriate
- [x] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

packages/phishing-controller/src/PhishingController.ts

@@ -28,7 +28,7 @@ export const CLIENT_SIDE_DETECION_BASE_URL =
   'https://client-side-detection.api.cx.metamask.io';
 export const C2_DOMAIN_BLOCKLIST_ENDPOINT = '/v1/request-blocklist';
 
-export const C2_DOMAIN_BLOCKLIST_REFRESH_INTERVAL = 15 * 60; // 15 mins in seconds
+export const C2_DOMAIN_BLOCKLIST_REFRESH_INTERVAL = 5 * 60; // 5 mins in seconds
 export const HOTLIST_REFRESH_INTERVAL = 5 * 60; // 5 mins in seconds
 export const STALELIST_REFRESH_INTERVAL = 30 * 24 * 60 * 60; // 30 days in seconds