Unit test coverage for API v5 Statuses

[zrhoffman]

This PR adds test coverage for API v5 /statuses endpoint.

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Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Run unit tests

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Merging #7710 (7fbd466) into master (48ec14e) will increase coverage by 2.66%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7710      +/-   ##
============================================
+ Coverage     29.78%   32.45%   +2.66%     
  Complexity       98       98              
============================================
  Files           804      512     -292     
  Lines         86263    54106   -32157     
  Branches        965      965              
============================================
- Hits          25696    17561    -8135     
+ Misses        58426    35277   -23149     
+ Partials       2141     1268     -873     

Flag	Coverage Δ
golib_unit	?
grove_unit	?
t3c_unit	?
traffic_monitor_unit	?
traffic_ops_integration	69.39% <ø> (ø)
traffic_ops_unit	22.15% <ø> (+0.03%)	⬆️
traffic_portal_v2	74.38% <ø> (ø)
traffic_stats_unit	?
unit_tests	28.15% <ø> (+1.19%)	⬆️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.52% <ø> (ø)

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see 295 files with indirect coverage changes

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