Add related names to django models (manage - Interface)

[johannaengland]

This is the tenth (and final) 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 #2551 (0f6f747) into master (d3d3261) will not change coverage.
The diff coverage is 39.47%.

@@           Coverage Diff           @@
##           master    #2551   +/-   ##
=======================================
  Coverage   54.00%   54.00%           
=======================================
  Files         558      558           
  Lines       40588    40588           
=======================================
  Hits        21920    21920           
  Misses      18668    18668           

Impacted Files	Coverage Δ
python/nav/ipdevpoll/neighbor.py	50.86% <ø> (ø)
python/nav/ipdevpoll/plugins/statports.py	35.63% <0.00%> (ø)
python/nav/ipdevpoll/shadows/__init__.py	41.87% <ø> (ø)
python/nav/ipdevpoll/shadows/netbox.py	59.25% <0.00%> (ø)
python/nav/topology/vlan.py	27.12% <0.00%> (ø)
python/nav/watchdog/tests.py	68.94% <0.00%> (ø)
python/nav/web/info/room/views.py	30.45% <0.00%> (ø)
python/nav/web/ipdevinfo/utils.py	23.37% <0.00%> (ø)
python/nav/web/l2trace/__init__.py	97.94% <ø> (ø)
python/nav/web/navlets/forms.py	0.00% <ø> (ø)
... and 5 more

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[github-actions]

Test results

     12 files       12 suites   11m 12s ⏱️
3 225 tests 3 129 ✔️   96 💤 0 ❌
9 150 runs  8 862 ✔️ 288 💤 0 ❌

Results for commit 0f6f747.

♻️ This comment has been updated with latest results.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication