ref: avoid accessing options at module scope to build logo url (#79207)

(this accessed the database at module scope to look up the option value)

<!-- Describe your PR here. -->

src/sentry/integrations/metric_alerts.py

@@ -26,7 +26,6 @@
     "percentage(sessions_crashed, sessions)": "% sessions crash free rate",
     "percentage(users_crashed, users)": "% users crash free rate",
 }
-LOGO_URL = absolute_uri(get_asset_url("sentry", "images/sentry-email-avatar.png"))
 # These should be the same as the options in the frontend
 # COMPARISON_DELTA_OPTIONS
 TEXT_COMPARISON_DELTA = {
@@ -39,6 +38,10 @@
 }
 
 
+def logo_url() -> str:
+    return absolute_uri(get_asset_url("sentry", "images/sentry-email-avatar.png"))
+
+
 def get_metric_count_from_incident(incident: Incident) -> str:
     """Returns the current or last count of an incident aggregate."""
     incident_trigger = (
@@ -144,7 +147,7 @@ def incident_attachment_info(
     return {
         "title": title,
         "text": text,
-        "logo_url": LOGO_URL,
+        "logo_url": logo_url(),
         "status": status,
         "ts": incident.date_started,
         "title_link": title_link,
@@ -232,7 +235,7 @@ def metric_alert_attachment_info(
     return {
         "title": title,
         "text": text,
-        "logo_url": LOGO_URL,
+        "logo_url": logo_url(),
         "status": status,
         "date_started": date_started,
         "last_triggered_date": last_triggered_date,