[PM-19633] - remove SecurityTasks feature flag

[jaasen-livefront]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-19633

📔 Objective

This PR removes the SecurityTasks feature flag.

📸 Screenshots

⏰ 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

[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 – 765e686a-3216-45df-8255-ba408d89414f

Great job, no security vulnerabilities found in this Pull Request

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.59%. Comparing base (6800bc5) to head (1fbc1e3).
Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5979   +/-   ##
=======================================
  Coverage   47.59%   47.59%           
=======================================
  Files        1676     1676           
  Lines       74736    74736           
  Branches     6753     6753           
=======================================
  Hits        35569    35569           
  Misses      37706    37706           
  Partials     1461     1461           

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