Organizations: return organization roots for requests made by other accounts within the organization

[k-a-il]

Default account is linked to the organization, whereas other accounts within the organization do not have this reference. This PR fixes this issue.

Once an organization is created and a member account is added, the member account can now retrieve the details of the root account by using the ListRoots API.

Plus, if a member account is not part of any organization, the AWSOrganizationsNotInUseException exception will be raised, as described in the AWS documentation.

This PR re-uses approach introduced in the #8260

[bblommers]

The change LGTM @k-a-il - looks like the linter is currently failing though:
https://github.com/getmoto/moto/actions/runs/13013182740/job/36300800416?pr=8531

Looks like this is a simple matter of running ruff format moto/organizations/models to fix it

[k-a-il]

The change LGTM @k-a-il - looks like the linter is currently failing though: https://github.com/getmoto/moto/actions/runs/13013182740/job/36300800416?pr=8531

Looks like this is a simple matter of running ruff format moto/organizations/models to fix it

I forgot to run the linter! I’ve resolved it by running make format and make lint. It should be fixed now!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.63%. Comparing base (16abebb) to head (964600b).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8531   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files        1229     1229           
  Lines      106394   106420   +26     
=======================================
+ Hits        98553    98578   +25     
- Misses       7841     7842    +1     

Flag	Coverage Δ
servertests	27.92% <0.00%> (+<0.01%)	⬆️
unittests	92.60% <100.00%> (+<0.01%)	⬆️

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[bblommers]

Awesome, thank you @k-a-il. Welcome to Moto!