Send an earlier review queue email as the SLO approaches

[jboolean]

The review queue email now also goes out at one day, before the two-day SLO is missed, in addition to the existing send once the SLO has been missed. A new isApproachingSlo variable on the same review-queue-stale template switches the wording between the two.

Moderators get a heads-up a day earlier reading "The queue is approaching its SLO … waiting more than a day." Once something actually crosses two days, the wording reverts to the existing "The queue is behind its SLO … waiting for a few days."

The template body lives in Postmark, not in this repo, so it needs updating there to this:

  <p>
   Moderators,
  </p>

  <p>
   The queue is {{#isApproachingSlo}}approaching{{/isApproachingSlo}}{{^isApproachingSlo}}behind{{/isApproachingSlo}} its SLO. There are {{ storiesCount }} stories in the queue, some of which have been waiting {{#isApproachingSlo}}more than a day{{/isApproachingSlo}}{{^isApproachingSlo}}for a few days{{/isApproachingSlo}}.
  </p>

  <p class="important">
    <a href="{{ reviewStoriesUrl }}">Click here to go to the review queue</a>
  </p>
  
  <h3>Reviewing stats</h3>
  <ol>
  {{#each stats}}
  <li>{{reviewer}}: {{count}} stories</li>
  {{/each}}
  </ol>
  <p>
  Thanks for your help!
  </p>

Both variants pass Postmark's /templates/validate with no errors, and its SuggestedTemplateModel matches StoryReviewEmailTemplateData. The template alias is unchanged, so the Postmark edit and this code change can land in either order.

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[chatgpt-codex-connector]

Update the Postmark template before advancing the alert

This lowers the trigger to one day while continuing to send the existing review-queue-stale template. That template is explicitly not updated by this change and previously says the queue is already behind its two-day SLO, so any production run with a 1–2-day-old submitted story will send moderators a false breach notification. Deploy the revised Postmark content (or a new template alias) together with this threshold change rather than leaving the required external change as documentation only.

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