[PM-26714] Add unit tests for OrganizationService.InviteUsers to assert that autoscale emails are sent when expected

[r-tome]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-26714

📔 Objective

Add unit tests to cover the organization auto-scaling email scenario, which was previously untested.

One test asserts that the email is sent when auto-scaling occurs for the first time (OwnersNotifiedOfAutoscaling is null), and another asserts that no email is sent when auto-scaling has already occurred (OwnersNotifiedOfAutoscaling is not null).

⏰ 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

[github-actions]

Checkmarx One – Scan Summary & Details – 2474ba5f-ed67-421c-9c30-90bf24427ac5

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 50.58%. Comparing base (3bef572) to head (67f4a9d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6434      +/-   ##
==========================================
+ Coverage   50.55%   50.58%   +0.03%     
==========================================
  Files        1854     1854              
  Lines       82169    82169              
  Branches     7270     7270              
==========================================
+ Hits        41537    41566      +29     
+ Misses      39043    39012      -31     
- Partials     1589     1591       +2     

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