🚨 fix: coherence within associations fields authorization

[Paul-Bob]

Description

Fixes #2614

read_only and disabled options were interfering with the rendering of attach/create buttons on has_one fields, while not affecting other association fields such as has_many.

We decided to remove these options from the attach/create functionality to maintain consistency with other fields, and now attach/create is controlled solely through authorization (attach_{association}? / create_{association}?).

🚨 Breaking Changes

Heads up: read_only and disabled don't affect has_one fields anymore.

Please search for all has_one fields still using the read_only or disabled options and update them with the correct authorization methods: attach_{association}? and create_{association}?

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
  • has_one breaking changes docs.avohq.io#352
• I have added tests that prove my fix is effective or that my feature works

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