[Extensions] Pass extensionId in recordExtensionUsageUkm

Update `metricsPrivate.recordExtensionUsageUkm` url param to the
appId of the extension. will generate the url from the appId
instead since that's all the caller has access to.

Bug-Id: 454342830
Change-Id: Ic7d4c0d958a53166548dc955230a60370cf2fa50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7204442
Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
Reviewed-by: Justin Lulejian <jlulejian@chromium.org>
Commit-Queue: marissa shen <marissashen@google.com>
Cr-Commit-Position: refs/heads/main@{#1560757}
NOKEYCHECK=True
GitOrigin-RevId: 021a251dcb4bcbcc9b6ed02f7f038032f258f1e8