task: #3578228 Add settings tab to domain admin page

Frank Mablyrequested to merge
issue/domain_path-3578228:3578228-add-domain-path into 3.x

Move settings route under /admin/config/domain/domain_path and add a local task so the settings appear as a tab alongside other domain submodules. Hide the "Enable domain configuration" button on the settings form via disallowed routes alter hook.

Closes #3578228

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