Fix flaky spec 410497

What does this MR do and why?

Fixes and unquarantines the flaky spec detailed in #410497 (closed)

This has a similar root cause to !130216 (merged). In that one the visit method was monkeypatched to wait_for_requests, but we need to insert the expectation of an alert/confirm between these two actions. The same is true of the click_link method for this spec. As with !130216 (merged), this MR allows the click_link method to take a block and this can be used to place the expectation before waiting for requests to complete.

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