Introduce Yandex in some regions

[bsclifton]

Test plan

See brave/brave-core#7090

Description

Yandex is not currently shown in any default lists (it can only be added via Open Search). Searches made using that Open Search entry are are not being attributed to Brave.

The goal for this issue would be to:

• Add Yandex for applicable regions
• Set as default for applicable regions
• Ensure the URL used for search attributes Brave for search results

Applicable regions

1. Republic of Armenia (AM)
2. Republic of Azerbaijan (AZ)
3. Republic of Belarus (BY)
4. Kyrgyz Republic (KG)
5. Republic of Kazakhstan (KZ)
6. Republic of Moldova (MD)
7. Russian Federation (RU)
8. Republic of Tajikistan (TJ)
9. Turkmenistan (TM)
10. Republic of Uzbekistan (UZ)

[LaurenWags]

Verified passed on LG Nexus 5 with Android 5.1 running 1.18.69 Bravearm.apk

Verified test cases outlined under brave/brave-core#7258 (comment) for the following languages:

1. Armenian (Republic of Armenia)
2. Russian (spoken in Republic of Belarus, Kyrgyz Republic, Republic of Kazakhstan, Russian Federation, Republic of Tajikistan, Turkmenistan, Republic of Uzbekistan)

• ensured that Yandex was available as a choice via the SE onboarding in the above regions as per Introduce Yandex in some regions #12327
• ensured that selecting Yandex from the SE onboarding switches the default SE for both Standard Tab & Private Tab
• ensured that searching via the URL bar uses the clid=2423859 attribution
• ensured that searching via yandex.ru doesn't use our clid=2423859 attribution
• encountered Yandex not being set as the default search engine in specific regions #12979

Armenian	Russian

Unable to confirm the above for the following as my device does not have these languages:

1. Azerbaijani (Republic of Azerbaijan)
2. Belarusian (Republic of Belarus)
3. Kyrgyz (Kyrgyz Republic)
4. Kazakh (Republic of Kazakhstan)
5. Moldovan (Republic of Moldova)
6. Tajiki (Republic of Tajikistan)
7. Turkmen (Turkmenistan)
8. Uzbek (Republic of Uzbekistan)

[btlechowski]

Verification passed on

Brave	1.18.69 Chromium: 87.0.4280.88 (Official Build) (64-bit)
Revision	89e2380a3e36c3464b5dd1302349b1382549290d-refs/branch-heads/4280@{#1761}
OS	Windows 7 Service Pack 1 (Build 7601.24544)

Verified test plan from brave/brave-core#7090

Verified Russia, Armenia, Azerbaijan, Belarus, Kyrgyz, Kazakh, Moldovan, Tajiki, Turkmen, Uzbek on clean profile
Verified Onboarding:

Verified default search engine in Normal Window
Verified searching via the URL bar uses the clid=2423859 attribution

Verified default search engine in Private Window
Verified searching via the URL bar uses the clid=2423859 attribution

Verified Yandex is default search trough context menu

Verified search trough context menu uses the clid=2423859 attribution
Verified Duckduckgo is used as default engine in Private Window with Tor

Verified Russia on upgraded profile from 1.17.x
On 1.17.x

On 1.18.x

Verified US - sanity check
Verified Onboarding:
Goggle is default

Verified default search engine in Normal Window

Verified default search engine in Private Window