[PM-32189] Add feature flag for premium-upsell-account-age

[jengstrom-bw]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-32189

📔 Objective

Add feature flag for pm-32180-premium-upsell-account-age

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – c17eebdd-c4c4-4a6e-826c-56d1537e076a

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 56.28%. Comparing base (94f7266) to head (b65c612).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7000   +/-   ##
=======================================
  Coverage   56.28%   56.28%           
=======================================
  Files        1986     1986           
  Lines       87667    87667           
  Branches     7816     7816           
=======================================
  Hits        49345    49345           
  Misses      36491    36491           
  Partials     1831     1831           

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