fix: don't render detach button when can't detach record

[Paul-Bob]

Description

Related PR: #1801

This PR avoid rendering the detach button when the association configuration don't allow it. In order to have the detach button, ensure that the association have the optional: true in the belongs_to side of the 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
• I have added tests that prove my fix is effective or that my feature works

Manual review steps

1. Step 1
2. Step 2

Manual reviewer: please leave a comment with output from the test if that's the case.

[codeclimate]

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[github-actions]

This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.

[adrianthedev]

We should update @jcn from Discord that we made this change and will be available in the next release.