ci: disable summoner smoke tests (#4724)

## Describe your changes
The summoner has served its purpose. Let's stop running
summoner-specific smoke tests after every merge to main.

## Issue ticket number and link
N/A

## Checklist before requesting a review

- [x] If this code contains consensus-breaking changes, I have added the
"consensus-breaking" label. Otherwise, I declare my belief that there
are not consensus-breaking changes, for the following reason:

  > ci-only, no application code changes

Co-authored-by: Conor Schaefer <[email protected]>