personalization: misc cleanup

* delete obsolete closure compiler annotations
* tighten test interface provider type specification
* remove allowjs option for test typescript config

Bug: None
Change-Id: I3a28eb86f6486925556623c78188360c8ed3873f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3382219


Reviewed-by: Jason Thai <jasontt@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/main@{#958147}