remove Set default search engine screen for CA / DE / FR / GB / US

[rebron]

Test plan

See #18331

Description

In brave://welcome/, remove Set default search engine screen for the following locales: CA / DE / FR / GB and US.

Expected Result

1. Go to brave://welcome/
2. Set default search engine screen should be removed for CA / DE / FR / GB and US. Screen should remain for all other locales.
3. Onboarding should be four steps now instead of five.

Brave version (brave://version info)

Target version is 1.31.x

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? n/a
• Can you reproduce this issue with the nightly channel? n/a

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? n/a
• Does the issue resolve itself when disabling Brave Rewards? n/a
• Is the issue reproducible on the latest version of Chrome? n/a

Miscellaneous Information:

Dependency on #18331

Please see details here: https://github.com/brave/internal/issues/816

[kjozwiak]

Adding QA/Blocked as the above will require a 1.31.x RC which I'm hoping to kick off tonight 👍 We'll need 1.31.84 or higher.

[LaurenWags]

Removing QA/Blocked since 1.31.84 is available - https://github.com/brave/brave-browser/releases/tag/v1.31.84

[kjozwiak]

@brave/legacy_qa as discussed with @bsclifton, the full verifications were done on Nightly on Win via brave/brave-core#10326 (comment) before uplifting the Brave Search work into 1.31.x. So in interest of time, we can just run through ~two of the locales when running through verifications rather than checking all five of the locales (CA / DE / FR / GB / US).

[LaurenWags]

Verified passed with

Brave | 1.31.84 Chromium: 95.0.4638.40 (Official Build) (x86_64)
-- | --
Revision | e3e7c76ba0284b16087cf4cf3153abfaef6470c7-refs/branch-heads/4638@{#624}
OS | macOS Version 10.15.7 (Build 19H1417)

Verified brave/brave-core#10326 (comment) for US and GB regions.

Confirmed that the search section under brave://welcome was removed for US and GB regions:

Example	Example

Confirmed that the search section under brave://welcome was not removed for Spain and Russia regions:

Spain	Spain	Russia	Russia

---

Verified PASSED using

Brave	1.31.84 Chromium: 95.0.4638.40 (Build oficial) (64 bits)
Revisión	e3e7c76ba0284b16087cf4cf3153abfaef6470c7-refs/branch-heads/4638@{#624}
Sistema operativo	Linux

Verified brave/brave-core#10326 (comment) for US and GB regions.

Confirmed that the search section under brave://welcome was removed for FR and DE regions:

Example	Example

Confirmed that the search section under brave://welcome was not removed for Poland and Spain regions:

Poland	Poland	Spain	Spain

---

Verification passed on

Brave | 1.31.84 Chromium: 95.0.4638.40 (Official Build) (64-bit)
-- | --
Revision | e3e7c76ba0284b16087cf4cf3153abfaef6470c7-refs/branch-heads/4638@{#624}
OS | Windows 10 Version 21H1 (Build 19043.1266)

Confirmed that the search section under brave://welcome was removed for US, GB and CA regions:

US	GB	CA

Confirmed that the search section under brave://welcome was not removed for Japan region: