Fix inline integration setup guidance

[superdav42]

Summary

• present provider-specific setup guidance alongside integration configuration fields
• send retired step=instructions URLs to the combined configuration step
• clarify the shared configuration heading and improve checklist spacing

Testing

• vendor/bin/phpunit --filter Hosting_Integration_Wizard_Admin_Page_Test (51 tests, 75 assertions)
• vendor/bin/phpcs inc/admin-pages/class-hosting-integration-wizard-admin-page.php views/wizards/host-integrations/configuration.php
• vendor/bin/phpstan analyse inc/admin-pages/class-hosting-integration-wizard-admin-page.php
• pre-commit hook passed

Coordination

Companion Domain Seller change: https://github.com/Ultimate-Multisite/ultimate-multisite-domain-seller/pull/329

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[github-actions]

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