Uplift Brave Talk to Beta/Release

[bsclifton]

Test plan

1. Ensure Brave Talk is enabled in Griffin
2. Fresh profile
3. Launch Brave
4. Open a new tab
5. You should see the Brave Talk promo (bottom right)
6. If you click Edit Cards you should be able to add Brave Talk

Description

Currently, Brave Talk is only on Nightly. We need to show it for all channels:

• Brave Talk widget
• Icon in bottom right of NTP
• Tooltip that shows
• other places?

[stephendonner]

Description

Currently, Brave Talk is only on Nightly. We need to show it for all channels:

• Brave Talk widget
• Icon in bottom right of NTP
• Tooltip that shows
• other places?

It's in Sidebar, but don't think Sidebar itself is ready (and there shouldn't be anything to do anyhow?)

[kjozwiak]

Adding QA/Blocked until we get Brave Talk enabled on main (staging) via Griffin. After it's enabled on staging, QA will be able to run through the above verification. Once we get closer to Brave Talk release date, we'll push the same change into production.

[kjozwiak]

Removing QA/Blocked as brave/brave-variations#93 was merged into main (Griffin staging).

[GeetaSarvadnya]

Verification passed on

Brave | 1.28.105 Chromium: 92.0.4515.131 (Official Build) (64-bit)
-- | --
Revision | 6b8d6c56ce21e38a72f7c4becb5abc1fa5134f29-refs/branch-heads/4515@{#1933}
OS | Windows 10 OS Version 2009 (Build 19043.1110)

• ensured that Brave Talk widget is enabled via NTP on main (staging) after launching brave via the following:
  brave.exe --variations-server-url=https://variations.bravesoftware.com/seed
• ensured that BraveTalkStudy is enabled via brave://version/?show-variations-cmd
  
• ensured that the BraveTalk promo tooltip is shown in NTP when the OS clock is forwarded to 3 days

now	after 3 days

• Confirmed Brave Talk can be added to NTP widgets via Edit Cards