Publish full variation names on brave://version

[iefremov]

For now, brave://version shows some hashed data instead of real variation names (if they exist). We should show full names.

[iefremov]

Edited this issue to only mention full names instead of hashes. For the opt-out toggle on Desktop filed a new one #15711 (cc @moritzhaller )

[stephendonner]

Verified FIXED using the steps from brave/brave-core#8699, and build

Brave	1.26.18 Chromium: 91.0.4472.38 (Official Build) nightly (64-bit)
Revision	8155e7afab5d695cf0e028f4d77203287523cda9-refs/branch-heads/4472_35@{#6}
OS	Windows 10 OS Version 2009 (Build 21376.1)

Steps:

1. clean profile
2. launch Brave
3. restart Brave
4. open brave://version
5. look at the bottom Variations: section

Confirmed that my brave://version page shows the following (without cryptic hash values):

Variations: AdvertiserSplitTestStudy:GroupB
EphemeralStorageStudy:Enabled
PermissionLifetimeStudy:Enabled

---

Verified PASSED using the steps from brave/brave-core#8699 with build

Brave	1.27.45 Chromium: 91.0.4472.88 (Official Build) nightly (x86_64)
Revision	109e9cd038b94a631aea7d40ee3d56c1278f2597-refs/branch-heads/4472@{#1385}
OS	macOS Version 11.4 (Build 20F71)

Had the following variations:

AdServingStudy:MaximumAdNotificationsPerDay=60
AdvertiserSplitTestStudy:GroupA
BraveAds.FrequencyCappingStudy:ExcludeAdIfWithinTimeWindow=0h
BraveAds.ShowCustomAdNotificationOnMacStudy:Default
BraveAds.UserActivityStudy:Triggers=EMPTY/Threshold=0.0/IdleTimeThreshold=5
EphemeralStorageStudy:Enabled
PermissionLifetimeStudy:Enabled

[srirambv]

Verification passed on the following devices running 1.26.46 x64 build

• Verified test plan from 14780: Always show full variation names. brave-core#8699

OnePlus 6T (Android 10)	Samsung Tab A (Android 10)