[#901,#906] API to obtain related resources

[SilviaAmAm]

Fixes #901
Fixes #906

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.54545% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.35%. Comparing base (380ffdd) to head (f543224).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...end/src/openarchiefbeheer/destruction/api/views.py	54.54%	5 Missing ⚠️
...src/openarchiefbeheer/external_registers/plugin.py	89.13%	5 Missing ⚠️
...eer/external_registers/contrib/openklant/plugin.py	88.88%	3 Missing ⚠️
...c/openarchiefbeheer/external_registers/registry.py	91.30%	2 Missing ⚠️
...ers/contrib/openklant/setup_configuration/steps.py	94.73%	1 Missing ⚠️
.../src/openarchiefbeheer/external_registers/utils.py	93.75%	1 Missing ⚠️
...ngs/pages/health-check/HealthCheckSettingsPage.tsx	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #927      +/-   ##
==========================================
+ Coverage   90.28%   90.35%   +0.06%     
==========================================
  Files         214      228      +14     
  Lines        6885     7151     +266     
  Branches      696      704       +8     
==========================================
+ Hits         6216     6461     +245     
- Misses        669      690      +21     

Flag	Coverage Δ
backend	91.55% <94.56%> (+0.09%)	⬆️
jest	34.11% <11.76%> (-0.19%)	⬇️
storybook	83.48% <94.11%> (-0.05%)	⬇️

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