supabase / supabase / 21810545916

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Update cron job overview to opt to skip JOIN depending on query cost (#42492)

## Context

The Integrations -> Cron overview page renders a list of cron jobs by
doing a join on both `cron.jobs` and `cron.job_run_details` in order to
pull the data for "Latest run" and "Status" ("Next run" is just derived
from "Latest Run" and the job's schedule)

In the past, we've had users run into issues where this query would time
out, likely due to the join on `job_run_details` especially if that
table is really big (and the columns on that table aren't indexed), and
our solution was to inform users to clear out that table + schedule a
job to clean the `job_run_details` table on a certain cadence. This CTA
however blocks the UI from rendering the cron jobs overview entirely

<img width="1644" height="590" alt="image"
src="https://github.com/user-attachments/assets/1a0458e9-f686-452b-88bc-44459bc7c615"
/>

## Changes involved

Am opting to use the new preflight check introduced
[here](https://github.com/supabase/supabase/pulls?q=is%3Apr+author%3Ajoshenlim+is%3Aclosed)
- Attempt to fetch the data for the cron jobs overview normally
- If preflight check rejects (due to high cost), then opt to fetch the
data while omitting the join
  - Show a banner instead to inform the user accordingly
- So that way users can still view their cron jobs (the latest run
column is a nice to have convenience really)
<img width="1151" height="379" alt="image"
src="https://github.com/user-attachments/assets/72cfaafb-e951-4601-b54e-c36a6f36332d"
/>

- Clicking learn more will then open a dialog to explain what this is
all about
- The steps to clear the `job_run_details` table + schedule a clean up
job still remains
<img width="450" height="484" alt="image"
src="https://github.com/user-attachments/assets/4491e766-64a1-40c9-9703-2e8b0da11c3f"
/>
<img width="450" height="610" alt="Screenshot 2026-02-05 at 12 56 39"
src="https://github.com/user-attachments/assets/644c9a7b-5afb-46bb-8c1e-9ece39... (continued)

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