Update Is-Prerelease header to be integer instead of string

[trmartin4]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-13804

📔 Objective

In discussion on the consuming server PR for this change, we determined it would be better to serve this header as an integer (0/1) instead of string (true/false) for a boolean representation.

📸 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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 33.59%. Comparing base (ec92f82) to head (c1df3e3).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
libs/common/src/services/api.service.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11909      +/-   ##
==========================================
- Coverage   33.59%   33.59%   -0.01%     
==========================================
  Files        2825     2825              
  Lines       88289    88289              
  Branches    16834    16834              
==========================================
- Hits        29665    29658       -7     
- Misses      56301    56308       +7     
  Partials     2323     2323              

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[github-actions]

Checkmarx One – Scan Summary & Details – 9d9640d5-12e5-45b2-8d13-8540ad0c2ea4

No New Or Fixed Issues Found