Update staging hosts

Add rerouting logic for testnet4 tests
Split CI e2e workflow matrix into mempool, liquid and testnet4

frontend/cypress/e2e/mainnet/mainnet.spec.ts

@@ -344,7 +344,9 @@ describe('Mainnet', () => {
       cy.visit('/');
       cy.waitForSkeletonGone();
 
-      cy.changeNetwork('testnet4');
+      //TODO(knorrium): add a check for the proxied server
+      // cy.changeNetwork('testnet4');
+
       cy.changeNetwork('signet');
       cy.changeNetwork('mainnet');
     });