feat: added-hosted-preferences-to-onboarding-data

[Zaimwa9]

Thanks for submitting a PR! Please check the boxes below:

• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

Related to #5806
In order to save the hosting preferences in the onboarding object

How did you test this code?

• Added tests
• Postman requests

Exemple request (each item is removable):

PATCH http://localhost:8000/api/v1/auth/users/me/onboarding/

// body

{
    "tasks": [
        {
            "name": "test-view-doc"
        },
        {
            "name": "create_project",
            "completed_at": "2025-05-27T14:00:00Z"
        }
    ],
    "tools": {
        "completed": true,
        "integrations": [
            "mine",
            "craft"
        ]
    },
    "hosting_preferences": [
        "hello",
        "yolo"
    ]
}

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Aug 1, 2025 2:38pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Aug 1, 2025 2:38pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Aug 1, 2025 2:38pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5883	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5883	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5883	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5883	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5883	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.82%. Comparing base (de61b8b) to head (abdd461).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5883   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files        1258     1258           
  Lines       44785    44787    +2     
=======================================
+ Hits        43811    43813    +2     
  Misses        974      974           

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