fix(cli-repl): do not print prompt while evaluating MONGOSH-700

[addaleax]

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[addaleax]

@mcasimir Updated to account for the test failures. async-repl.ts is a better place for this, because that way we can reset the prompt before calling the REPL eval callback (not doing that caused the test failures), and because it’s the right place anyway (because async-repl.ts deals with everything related to the Node.js REPL not being able to handle async evaluation well).