chore: agent level check if slotstats are computed at rm level

[hamidzr]

(cherry picked from commit 370ef81d2eecf8971a49d6a77c4c84b4cd2c51e9)
safety net just in case one of the RM's doesn't include the summaries

Description

Test Plan

Commentary (optional)

https://github.com/determined-ai/determined-ee/pull/1227

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.80%. Comparing base (1a38f0c) to head (c7b549a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9073      +/-   ##
==========================================
- Coverage   47.06%   40.80%   -6.26%     
==========================================
  Files        1154      987     -167     
  Lines      142372   129941   -12431     
  Branches     2423     2421       -2     
==========================================
- Hits        67005    53027   -13978     
- Misses      75177    76724    +1547     
  Partials      190      190              

Flag	Coverage Δ
harness	41.66% <ø> (-22.41%)	⬇️
web	38.95% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
master/internal/api_agents.go	0.00% <ø> (ø)

... and 255 files with indirect coverage changes