[CL-806] Add feature flag for router focus mgmt

[vleague2]

🎟️ Tracking

CL-806

📔 Objective

Add a feature flag for some changes we are making to the way we manage users' focus on Angular router changes. We want to be able to flip it off without a release if we see issues, since it touches a large surface area and will be difficult to test.

Also I kept putting the wrong ticket number in branch names and commits, sorry, ignore those!

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 10e82ae3-4a5c-496e-99f2-72f82b6f9532

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.99%. Comparing base (08ce693) to head (1a76d12).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6623      +/-   ##
==========================================
- Coverage   53.00%   52.99%   -0.01%     
==========================================
  Files        1909     1909              
  Lines       84828    84828              
  Branches     7634     7634              
==========================================
- Hits        44961    44958       -3     
- Misses      38115    38117       +2     
- Partials     1752     1753       +1     

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[claude]

Claude Code is working…

I'll analyze this and get back to you.

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