feat: show promql_template_1 link in alert

What

Add a link to the promql_template_1 annotation if present to the alert template.

Before	After

Why

Before we refactored the template in https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15765 and https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15894 we used to show the promql_template_1 attached to the alert which was a more clear version of the metric for debugging what the problem is.

Reference: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16015