fix: job queue panic for multirm [RM-123]

[carolinaecalderon]

Description

Fix index bug in GetJobQueueStatsRequest by executing the proper RM call in a fanout call.

Also, add os.Run() to the multirm test file -- so now the tests run! Change the mock RM return values from mock.Anything to the relevant complex type.

Test Plan

Without the changes to the GetJobQueueStatsRequest, its test should fail the empty_request case as follows:

--- FAIL: TestGetJobQueueStatsRequest (0.00s)
    --- FAIL: TestGetJobQueueStatsRequest/empty_request (0.00s)
panic: runtime error: index out of range [0] with length 0 [recovered]
	panic: runtime error: index out of range [0] with length 0

With these changes, all should pass!

Commentary (optional)

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

RM-123

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.09%. Comparing base (f78b9aa) to head (e1c0d9b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9079      +/-   ##
==========================================
+ Coverage   47.07%   47.09%   +0.02%     
==========================================
  Files        1155     1156       +1     
  Lines      142400   142580     +180     
  Branches     2421     2421              
==========================================
+ Hits        67034    67153     +119     
- Misses      75176    75237      +61     
  Partials      190      190              

Flag	Coverage Δ
backend	43.04% <100.00%> (+0.09%)	⬆️
harness	64.07% <ø> (ø)
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/rm/multirm/multirm.go	83.33% <100.00%> (ø)

... and 5 files with indirect coverage changes

[NicholasBlaskey]

one blocking comment