Temporarily skip child-vaccination smoke test

[eyelidlessness]

Part of #205.

I really don't want to risk forgetting that this test is skipped. So I've conditioned the skip to be within a two week window, which we can easily extend as needed. I also included a non-code escape hatch to quickly unblock CI if rerun.

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[eyelidlessness]

After opening this I realized the form definition itself is the culprit. I'll update the issue with a more detailed explanation for posterity. For this PR, I think it's best to close. I'll have a replacement PR soon which takes the tack we discussed in Slack yesterday: creating an alternate form definition/test with a change to avoid the pathological case triggered by the form design as-is. I expect that replacement PR will also involve updating the child vaccination smoketest to account for further progress, since it was indexed-repeat and then jr:count blocking its progress previously.