feat(Billing): Cap Scale-Up seats at 20

[emyller]

• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Contributes to https://github.com/Flagsmith/flagsmith-private/issues/107

Restricts scale-up seat count to 20.

How did you test this code?

Updated unit tests.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Apr 10, 2026 10:55pm
flagsmith-frontend-preview	Ignored		Apr 10, 2026 10:55pm
flagsmith-frontend-staging	Ignored		Apr 10, 2026 10:55pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7217	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-7217	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-7217	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7217	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7217	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-7217	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.35%. Comparing base (9e3edac) to head (ba488b0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7217   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files        1348     1348           
  Lines       50691    50701   +10     
=======================================
+ Hits        49859    49869   +10     
  Misses        832      832           

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[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 11 passed

Details

 11 tests across 8 suites
 24.3 seconds
 ba488b0
 🔄 Run: #15985 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 11 passed

Details

 11 tests across 8 suites
 11.2 seconds
 ba488b0
 🔄 Run: #15985 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 17 passed

Details

 17 tests across 14 suites
 1 minute, 1 second
 ba488b0
 🔄 Run: #15985 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 17 passed

Details

 17 tests across 14 suites
 58.4 seconds
 ba488b0
 🔄 Run: #15985 (attempt 1)

[github-actions]

Visual Regression

16 screenshots compared. See report for details.
View full report