[CLEAN] Synthetic Benchmark PR #30384 - Add FXIOS-13851 [Japan MSCA] Add Firefox Japanese Guide deafult site

[ofir-frd]

Benchmark PR mozilla-mobile#30384

Type: Clean (correct implementation)

Original PR Title: Add FXIOS-13851 [Japan MSCA] Add Firefox Japanese Guide deafult site
Original PR Description: ## 📜 Tickets
Jira ticket
Github issue

💡 Description

• Add the Firefox Japanese Guide as a default site for the ja_JP locale
• Reorder ja_JP locale default site order so that Yahoo comes before Ambelo

🎥 Demos

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If adding or modifying strings, I read the guidelines and will request a string review from l10n
• If needed, I updated documentation and added comments to complex code
  Original PR URL: Add FXIOS-13851 [Japan MSCA] Add Firefox Japanese Guide deafult site mozilla-mobile/firefox-ios#30384

[github-actions]

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