Add related names to django models (manage - Switch/topology)

[johannaengland]

This is the ninth part of splitting up #2423.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #2550 (c9c8432) into master (89811b2) will decrease coverage by 0.04%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2550      +/-   ##
==========================================
- Coverage   53.76%   53.73%   -0.04%     
==========================================
  Files         558      558              
  Lines       40588    40588              
==========================================
- Hits        21824    21811      -13     
- Misses      18764    18777      +13     

Impacted Files	Coverage Δ
python/nav/eventengine/plugins/linkstate.py	26.27% <0.00%> (ø)
python/nav/models/profiles.py	69.53% <ø> (ø)
python/nav/portadmin/napalm/juniper.py	45.88% <0.00%> (ø)
python/nav/portadmin/snmp/base.py	46.68% <0.00%> (ø)
python/nav/topology/detector.py	50.50% <0.00%> (ø)
python/nav/topology/vlan.py	27.12% <ø> (ø)
python/nav/web/ipdevinfo/utils.py	23.37% <ø> (ø)
python/nav/web/networkexplorer/mixins.py	27.51% <0.00%> (ø)
python/nav/web/portadmin/views.py	14.97% <0.00%> (ø)
python/nav/models/manage.py	71.51% <66.66%> (ø)
... and 2 more

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[github-actions]

Test results

     12 files       12 suites   11m 1s ⏱️
3 222 tests 3 126 ✔️   96 💤 0 ❌
9 141 runs  8 853 ✔️ 288 💤 0 ❌

Results for commit c9c8432.

♻️ This comment has been updated with latest results.

[hmpf]

Codecov is being annoying. Also, see one question.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication