`spaces` > `should allow user to create private space` is flaky

[SimonBrandner]

https://dashboard.cypress.io/projects/ppvnzg/runs/3109/test-results/cf23f41c-c494-41e8-8699-7602decddbae

[t3chguy]

The test is written poorly, doesn't leverage the Retry behaviour well.

> 132 | cy.get(".mx_RoomTile").contains("Random").should("exist");
Should be more akin to cy.get(".mx_RoomList").contains(".mx_RoomTile", "Random").should("exist");