Tenants rfc3339 apiv5

[kdamichie]

Related: #5911
This PR changes the returned timestamp to be RFC3339 format for tenants in APIv5.

---

Which Traffic Control components are affected by this PR?

• Documentation
• Traffic Ops

What is the best way to verify this PR?

Ensure tests pass
Hit the tenants endpoint for v5 and verify that the timestamps returned are in RFC3339 format.

If this is a bugfix, which Traffic Control versions contained the bug?

• master

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 #7749 (21ec3a9) into master (75ec56f) will decrease coverage by 33.10%.
Report is 90 commits behind head on master.
The diff coverage is 60.64%.

@@              Coverage Diff              @@
##             master    #7749       +/-   ##
=============================================
- Coverage     65.05%   31.95%   -33.10%     
  Complexity       98       98               
=============================================
  Files           314      712      +398     
  Lines         12365    81652    +69287     
  Branches        907      965       +58     
=============================================
+ Hits           8044    26092    +18048     
- Misses         3968    53409    +49441     
- Partials        353     2151     +1798     

Flag	Coverage Δ
golib_unit	53.68% <60.29%> (?)
grove_unit	12.02% <ø> (?)
t3c_unit	5.99% <3.31%> (?)
traffic_monitor_unit	26.33% <0.00%> (?)
traffic_ops_integration	69.38% <ø> (-0.04%)	⬇️
traffic_ops_unit	21.68% <ø> (?)
traffic_portal_v2	74.38% <74.17%> (+0.59%)	⬆️
traffic_stats_unit	10.76% <ø> (?)
unit_tests	29.25% <60.64%> (-44.53%)	⬇️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.49% <ø> (-0.14%)	⬇️

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

Files Changed	Coverage Δ
cache-config/t3c-apply/config/config.go	0.00% <0.00%> (ø)
cache-config/t3c-apply/torequest/cmd.go	0.00% <0.00%> (ø)
cache-config/t3c-check-refs/t3c-check-refs.go	1.78% <0.00%> (ø)
cache-config/t3c-generate/cfgfile/varnish.go	0.00% <0.00%> (ø)
cache-config/t3c-generate/config/config.go	0.81% <0.00%> (-0.08%)	⬇️
cache-config/t3c-generate/t3c-generate.go	0.00% <ø> (ø)
experimental/traffic-portal/src/app/api/index.ts	100.00% <ø> (ø)
...mental/traffic-portal/src/app/api/testing/index.ts	100.00% <ø> (ø)
...perimental/traffic-portal/src/app/app.ui.module.ts	100.00% <ø> (ø)
...tatuses/statuses-table/statuses-table.component.ts	82.35% <ø> (ø)
... and 86 more

... and 367 files with indirect coverage changes

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[zrhoffman]

You addressed my comments already in updates, just 1 last nit about import order )

[zrhoffman]

Changelog looks a little weird, once that's fixed I can merge :)

[zrhoffman]

Looks good!