Flaky test: TestInitTtySizeErrors() (on macOS "latest")

[thaJeztah]

Looks like this test is flaky on macOS ("latest"); could be due to macOS updates perhaps (but the "resize" code has been known to be somewhat racy/flaky, so perhaps some improvements are needed)

--- FAIL: TestInitTtySizeErrors (0.10s)
    tty_test.go:29: assertion failed: 
        --- expectedError
        +++ →
        @@ -1,2 +1 @@
        -failed to resize tty, using default size

[thaJeztah]

Test flakiness was fixed in #3573 and #3584

There's some remaining work to be done, which is tracked through #3554