* 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.

The decrupt message confirmation UI will crash if the origin metadata
is not present. This PR makes the UI tolerant of that metadata being
missing. It was always intended to be optional anyway.

All commits have been included in the changelog

Version v9.0.3 RC

* origin/develop: (29 commits)
  Reset swaps routeState in navigateBackToBuildQuote (#10166)
  Fix decrypt message confirmation UI crash (#10252)
  Fix site metadata JSON-RPC handler (#10243)
  Fix design system error constants (#10246)
  Remove unused environment variables (#10234)
  Update `yarn.lock` (#10241)
  Update postMessage structure for TrezorConnect 8 (#10192)
  Increase minimum Firefox version to v68 (#10195)
  Bump socket.io from 2.2.0 to 2.4.1 (#10232)
  Update `@reduxjs/toolkit` from v1.3.2 to v1.5.0 (#10228)
  eth-rpc-errors@4.0.2 (#10226)
  Add MAX_SAFE_CHAIN_ID and refactor chain ID validation (#10224)
  add chip component (#10199)
  add new typography component (#10197)
  @metamask/inpage-provider@8.0.3 (#10219)
  Add NETWORK_TYPE_RPC constant (#10203)
  Further improve organization of constants (#10200)
  add includePaths to sass-loader in storybook (#10213)
  Disable the swaps submit button after the first time it is clicked (#10162)
  Remove default to 18 decimals in quotesToRenderableData method (#10212)
  ...