[P1] util.js: relocate URL / origin helpers to url-utils (dedupe)

**Parent Epic:** [#44552 — `util.js` decomposition](https://github.com/MetaMask/metamask-extension/issues/44552)
**Source:** `ui/helpers/utils/util.js`
**Size:** L

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## Problem

`getURL`, `getURLHost`, `getURLHostName`, `isExtensionUrl`, `stripHttpsSchemeWithoutPort` (+ private `stripHttpsScheme`), `isIpAddress`, `transformOriginToTitle` (fan-out cluster 10–12). Several are near-duplicates of `shared/lib/url-utils.ts`: `getURL`↔`getValidUrl`, `isIpAddress`↔`isLocalhostOrIPAddress`, `getURLHost*`↔`getDomain`/`onlyKeepHost`.

## Solution

Move to `shared/lib/url-utils.ts`, reconciling the duplicates (prefer the existing canonical helper where equivalent). Codemod the 10–12 import sites.

## Acceptance Criteria

- [ ] URL helpers consolidated in `url-utils.ts`; duplicates reconciled; originals deleted; imports rewired. Tests green.

Start with ui/helpers/utils/util.js and shared/lib/url-utils.ts, comparing the listed URL helpers and their near-duplicates. Locate the 10–12 import sites, then reconcile the helpers in url-utils.ts and rewire those imports. Done means the originals are deleted, duplicates are consolidated, and the test suite is green.

Written by the indexing model from the issue text.