Update the "remove fork relationship" confirmation
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### Problem to solve
The "remove project" confirmation is being updated under https://gitlab.com/gitlab-org/gitlab/-/issues/220243 and https://gitlab.com/gitlab-org/gitlab/-/issues/24401. The "remove fork relationship" confirmation is similar and should be updated to match.
### Further details
- This was inspired by https://gitlab.com/gitlab-org/gitlab/-/issues/24401#note_368232245
- Example of the existing/deprecated design:
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<summary>Example</summary>

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### Proposal
The "remove fork relationship" confirmation looks similar to the [new "remove project" confirmation](https://gitlab.com/gitlab-org/gitlab/-/issues/220243), and similarly [confirms the namespace](https://gitlab.com/gitlab-org/gitlab/-/issues/24401).
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