Extract delete user confirmation sheet into its own view

[crazytonyli]

[!Note] This PR is built on top of https://github.com/wordpress-mobile/WordPress-iOS/pull/23834.

Nothing too interesting really. Just moving a ViewBuilder function to a View type.

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• [ ] I have completed the Regression Notes.
• [ ] I have considered adding unit tests for my changes.
• [ ] I have considered adding accessibility improvements for my changes.
• [ ] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• [ ] WordPress.com sites and self-hosted Jetpack sites.
• [ ] Portrait and landscape orientations.
• [ ] Light and dark modes.
• [ ] Fonts: Larger, smaller and bold text.
• [ ] High contrast.
• [ ] VoiceOver.
• [ ] Languages with large words or with letters/accents not frequently used in English.
• [ ] Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• [ ] iPhone and iPad.
• [ ] Multi-tasking: Split view and Slide over. (iPad)

[dangermattic]

	1 Warning
:warning:	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.

Generated by :no_entry_sign: Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr23835-c95b8fa
	Version	25.4.2
	Bundle ID	org.wordpress.alpha
	Commit	c95b8fa0594c45ec5f2eecca60da1e273a5688ff
	App Center Build	WPiOS - One-Offs #11088

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr23835-c95b8fa
	Version	25.4.2
	Bundle ID	com.jetpack.alpha
	Commit	c95b8fa0594c45ec5f2eecca60da1e273a5688ff
	App Center Build	jetpack-installable-builds #10129

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[kean]

The current form look a bit off.

Id suggest the following changes (not necessarily in the scope of this PR):

• Shorter title for the field and remove :
• Push list of users in the navigation stack + use the same design and maybe even code to render the post list
• Smaller spacing for the header

        Form {
            Section {
                NavigationLink {
                    EmptyView()
                } label: {
                    HStack {
                        Text("Selected User")
                        Spacer()
                        Text("username2")
                            .foregroundStyle(.secondary)
                    }

                }
            } header: {
                Text("Select the user to attribute the content of the site to")
                    .font(.body)
                    .textCase(nil)
                    .foregroundStyle(.primary)
                    .padding(.bottom, 8)
            }
        }