Bug 261810 – [WPT] Wheel actions: Follow tick-based event dispatch logic rather than sending scroll events instantaneously

• Status: RESOLVED
• Resolution: FIXED
• Component: UI Events

[Abrar Rahman Protyasha]

I.e. make dispatchWheelActions in testdriver-vendor.js a faithful reproduction of the steps outlined in https://w3c.github.io/webdriver/#dfn-perform-a-scroll.

[Radar WebKit Bug Importer]

<rdar://problem/115772410>

[Simon Fraser (smfr)]

The primary fix here is:
```
                 {
                     type : "wheel",
-                    momentumPhase : "ended"
+                    phase : "ended"
                 }
```
in testdriver-vendor.js.

[Simon Fraser (smfr)]

Pull request: https://github.com/WebKit/WebKit/pull/69689

[EWS]

Committed 317497@main (3b1deb16fd46): <https://commits.webkit.org/317497@main>

Reviewed commits have been landed. Closing PR #69689 and removing active labels.