feat(metrics-extraction): Add condition to update on-demand row (#64659)

### Summary
This will cause the row to always be updated, which fixes the trouble
with all the widget queries date modified being set to when the
migration ran (Feb 5th) despite them likely being older than an on
demand row

Author: k-fish

src/sentry/options/defaults.py

@@ -1702,6 +1702,12 @@
     default=False,
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
+# Overrides modified date and always updates the row. Can be removed if not needed later.
+register(
+    "on_demand.update_on_demand_modified",
+    default=False,
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
 
 register(
     "delightful_metrics.minimetrics_sample_rate",

src/sentry/tasks/on_demand_metrics.py

@@ -6,6 +6,7 @@
 
 import sentry_sdk
 from celery.exceptions import SoftTimeLimitExceeded
+from django.utils import timezone
 
 from sentry import options
 from sentry.api.utils import get_date_range_from_params
@@ -295,6 +296,11 @@ def _set_widget_on_demand_state(
         if on_demand.can_extraction_be_auto_overridden():
             on_demand.extraction_state = extraction_state
 
+        if options.get("on_demand.update_on_demand_modified"):
+            # Only temporarily required to check we've updated data on rows the task has passed
+            # Or updated to pass the check against widget query date_modified.
+            on_demand.date_modified = timezone.now()
+
         on_demand.spec_hashes = spec_hashes
         on_demand.save()