Fix site metadata JSON-RPC handler (#10243)

* Fix getting the site metadata from the request origin params.

Regressed from inpage-provider ts migration the request. The property domainMetadata is now set as a params key for the request.

https://github.com/MetaMask/inpage-provider/blob/v7.0.0/src/siteMetadata.js#L19-L25
vs
https://github.com/MetaMask/inpage-provider/blob/main/src/siteMetadata.ts#L19-L27

* Change hardcoded mocked response of the request to the prod response.

app/scripts/controllers/permissions/permissionsMethodMiddleware.js

@@ -74,8 +74,8 @@ export default function createPermissionsMethodMiddleware({
       // custom method for getting metadata from the requesting domain,
       // sent automatically by the inpage provider when it's initialized
       case 'metamask_sendDomainMetadata': {
-        if (typeof req.domainMetadata?.name === 'string') {
-          addDomainMetadata(req.origin, req.domainMetadata)
+        if (typeof req.params?.name === 'string') {
+          addDomainMetadata(req.origin, req.params)
         }
         res.result = true
         return

test/unit/app/controllers/permissions/mocks.js

@@ -600,7 +600,7 @@ export const getters = deepFreeze({
       return {
         origin,
         method: 'metamask_sendDomainMetadata',
-        domainMetadata: {
+        params: {
           ...args,
           name,
         },