chore(severity): Register option for new issue escalation (#61876)

src/sentry/options/defaults.py

@@ -757,6 +757,13 @@ register(
     flags=FLAG_ALLOW_EMPTY | FLAG_AUTOMATOR_MODIFIABLE,
 )
 
+register(
+    "issues.severity.new-escalation-projects-allowlist",
+    type=Sequence,
+    default=[],
+    flags=FLAG_ALLOW_EMPTY | FLAG_AUTOMATOR_MODIFIABLE,
+)
+
 
 # ## sentry.killswitches
 #