Cypress - increase initial app load timeout to 30s (matrix-org#9361)

Author: Kerry

cypress/support/login.ts

@@ -97,7 +97,7 @@ Cypress.Commands.add("initTestUser", (synapse: SynapseInstance, displayName: str
 
  return cy.visit("/").then(() => {
  // wait for the app to load
- return cy.get(".mx_MatrixChat", { timeout: 15000 });
+ return cy.get(".mx_MatrixChat", { timeout: 30000 });
  }).then(() => ({
  password,
  accessToken: response.body.access_token,