* Cypress: `crypto.verification.request` -> `crypto.verificationRequestReceived`
matrix-org/matrix-js-sdk#3514 deprecated crypto.verification.request.
* Cypress: `beginKeyVerification` -> `startVerification`
matrix-org/matrix-js-sdk#3528 deprecated beginKeyVerification
* simplify `setupBotClient`
no functional change here, just combining the various `cy.wrap()`ed things into
a single async func
* Cypress: Use Rust crypto for the bot user in verification tests
We can already start using the Rust crypto implementation for the "bot" user in
the verification tests!