[PM-25081] Add Vault skeleton loader feature flag

[nick-livefront]

🎟️ Tracking

PM-25081
Client Side: bitwarden/clients#17337

📔 Objective

Add pm-25081-vault-skeleton-loaders feature flag

📸 Screenshots

N/A

⏰ 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

[claude]

Claude finished @nick-livefront's task —— View job

---

Code Review Complete

Clean implementation of a feature flag constant.

Findings

⚠️ Finding 1: Feature flag ordering inconsistency in src/Core/Constants.cs:255

---

[claude]

⚠️ This feature flag should be placed before PM25083_AutofillConfirmFromSearch (line 254) to maintain numerical ordering by PM number. The current placement has PM-25081 after PM-25083, which breaks the ascending order pattern used in this section.

[github-actions]

Checkmarx One – Scan Summary & Details – e20f0090-3978-42ef-8943-675f781263a8

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 52.77%. Comparing base (db36c52) to head (0a95d10).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6566      +/-   ##
==========================================
- Coverage   52.77%   52.77%   -0.01%     
==========================================
  Files        1910     1910              
  Lines       84843    84843              
  Branches     7576     7576              
==========================================
- Hits        44780    44777       -3     
- Misses      38328    38330       +2     
- Partials     1735     1736       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.