[PM-40006] Add temporary item sharing feature flag

[mcamirault]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-40006

📔 Objective

This PR adds a feature flag that will be used for the Temporary Item Sharing feature

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed the addition of a single feature flag constant TemporaryItemSharing (pm-34203-temporary-item-sharing) to src/Core/Constants.cs. The change follows the established naming convention (PascalCase C# name, pm-XXXXX-kebab-case string value) and is correctly placed in the Tools team section alongside the other Send/sharing flags. No security, correctness, or breaking-change concerns; feature flag constants are not unit-tested and this one introduces no behavior.

Code Review Details

No findings. This is a clean, low-risk change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.23%. Comparing base (3e79593) to head (6e5ca6d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7996   +/-   ##
=======================================
  Coverage   62.23%   62.23%           
=======================================
  Files        2287     2287           
  Lines       99663    99663           
  Branches     9004     9004           
=======================================
  Hits        62023    62023           
  Misses      35469    35469           
  Partials     2171     2171           

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