🔧 chore: remove GA'ed email perf regression ff (#89926)

Author: iamrajjoshi

src/sentry/features/temporary.py

@@ -110,7 +110,6 @@ def register_temporary_features(manager: FeatureManager):
     # Data Secrecy
     manager.add("organizations:data-secrecy", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     manager.add("organizations:devtoolbar", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, default=False, api_expose=True)
-    manager.add("organizations:email-performance-regression-image", OrganizationFeature, FeatureHandlerStrategy.OPTIONS, api_expose=False)
     # Enables synthesis of device.class in ingest
     manager.add("organizations:device-class-synthesis", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=False)
     # Enable device.class as a selectable column

src/sentry/notifications/notifications/rules.py

@@ -149,19 +149,13 @@ def get_recipient_context(
         }
 
     def get_image_url(self) -> str | None:
-        if features.has(
-            "organizations:email-performance-regression-image", self.group.organization
-        ):
-            image_builder = IssueAlertImageBuilder(
-                group=self.group, provider=ExternalProviderEnum.EMAIL
-            )
-            return image_builder.get_image_url()
-        return None
+        image_builder = IssueAlertImageBuilder(
+            group=self.group, provider=ExternalProviderEnum.EMAIL
+        )
+        return image_builder.get_image_url()
 
     def is_new_design(self) -> bool:
-        return features.has(
-            "organizations:email-performance-regression-image", self.group.organization
-        ) and self.group.issue_type in [
+        return self.group.issue_type in [
             PerformanceP95EndpointRegressionGroupType,
             ProfileFunctionRegressionType,
         ]