Traffic Portal v2 Topologies details page

[zrhoffman]

This PR adds the Topologies details page to Traffic Portal v2 with the following restrictions:

• The UI does not yet let you rearrange the cachegroups
• The UI does not yet let you add cachegroups
• The UI does not yet let you remove cachegroups

Depends on apache/trafficcontrol-trafficops-types#4 (merged)

---

Which Traffic Control components are affected by this PR?

• Traffic Portal v2

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 #7615 (4fbced1) into master (33d8179) will increase coverage by 38.12%.
Report is 1 commits behind head on master.
The diff coverage is 59.86%.

@@              Coverage Diff              @@
##             master    #7615       +/-   ##
=============================================
+ Coverage     28.97%   67.09%   +38.12%     
  Complexity       98       98               
=============================================
  Files           739      266      -473     
  Lines         82332    10130    -72202     
  Branches        908      952       +44     
=============================================
- Hits          23855     6797    -17058     
+ Misses        56435     3061    -53374     
+ Partials       2042      272     -1770     

Flag	Coverage Δ
golib_unit	?
grove_unit	?
t3c_unit	?
traffic_monitor_unit	?
traffic_ops_unit	?
traffic_portal_v2	73.69% <59.86%> (-0.24%)	⬇️
traffic_stats_unit	?
unit_tests	73.69% <59.86%> (+46.72%)	⬆️

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

Files Changed	Coverage Δ
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)
...fic-portal/src/app/api/testing/topology.service.ts	10.81% <10.81%> (ø)
...ies/topology-details/topology-details.component.ts	55.17% <55.17%> (ø)
...tal/traffic-portal/src/app/api/topology.service.ts	100.00% <100.00%> (ø)

... and 489 files with indirect coverage changes

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[zrhoffman]

Rebased onto master