Reland "[Android] Sync CachedFlags declared with listed in ChromeCachedFlags"

This is a reland of commit 4877e5a41e14851b264a1d9c111ad11d69c664cd

Test case for revert was already flaky. Not this CL's fault.

Original change's description:
> [Android] Sync CachedFlags declared with listed in ChromeCachedFlags
>
> There are some CachedFlags in ChromeFeatureList which are not listed
> in ChromeCachedFlags, which means their value is not cached (but past
> cached values are still used, so it may be useful in this corner case
> if they were at some point in ChromeCachedFlags).
>
> This CL:
> - Cleans up some launched flags that aren't being cached:
>     - CCTAllowCrossUidActivitySwitchFromBelow
>     - PartnerHomepageInitialLoadImprovement
> - Starts caching a flag that is not currently cached but seems like
>   it should
>     - BackGestureRefactorActivityAndroid
> - Removes some CachedFlags that were only declared presumably because
>   they had related cached field trial params (in this case it's not
>   required to cache the flag itself)
>     - LensCameraAssistedSearch
>     - OmahaMinSdkVersionAndroid
> - Removes a completely unused CachedFlag
>     - PrefetchNotificationSchedulingIntegration
>
> -
>
> Bug: 1442347
> Change-Id: Ia24480dcbc5f6b23ed02085dd67765de59a66314
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4533145
> Reviewed-by: Wenyu Fu <wenyufu@chromium.org>
> Reviewed-by: Lijin Shen <lazzzis@google.com>
> Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1144795}

Bug: 1442347
Change-Id: Ic85f22e51c659b02f44d1b2e1bb89e58019c9599
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4540021
Owners-Override: Sky Malice <skym@chromium.org>
Auto-Submit: Sky Malice <skym@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1144944}