Notifications: Include graph variant name in performance alerts

[setchy]

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Current behavior

Whenever a Performance Alert notification is delivered to Slack, the footer of this notification contains a row with the following information/convention

Service: {graphName} | {month} {date}

This makes it tricky to triage which variant the performance alert was for triggered for when using a shared slack channel (ie: a squad channel)

Enhancement proposal

Update the above convention to include the variant name / GRAPH_REF) for which the performance alert exceeded the configured thresholds - ie: {graphName}@{variantName}

[timbotnik]

@setchy this seems like a quick change - we're going to have a look.

[setchy]

Thank you @timbotnik

[timbotnik]

We landed a change here that surfaces the graph variant, note that it only works when you include a variant in the configuration for the alert.