[PM-33518] feat: Add isInAppUpgradeAvailableFlow to PremiumStateManager

[SaintPatrck]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-33518

📔 Objective

Add a consolidated isInAppUpgradeAvailableFlow to PremiumStateManager that combines isInAppBillingSupportedFlow and the MobilePremiumUpgrade feature flag into a single observable signal.

Stacked on PM-33517 PR (settings/premium management)

Changes

• Add isInAppUpgradeAvailableFlow: StateFlow<Boolean> to PremiumStateManager interface
• Implement in PremiumStateManagerImpl by combining billing support and feature flag flows
• Add unit tests for the new flow covering all flag/billing combinations

[github-actions]

Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR adds a new isInAppUpgradeAvailableFlow property to PremiumStateManager that combines isInAppBillingSupportedFlow and the MobilePremiumUpgrade feature flag into a single observable signal. The implementation follows the established combine + stateIn pattern already used by isPremiumUpgradeBannerEligibleFlow in the same class. Unit tests cover all four boolean combinations of the two input flows.

No findings.

[github-actions]

Checkmarx One – Scan Summary & Details – 21361e27-c2ca-4440-9395-a91030bd55e8

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 85.72%. Comparing base (581f032) to head (65f09c8).

Additional details and impacted files

@@                                Coverage Diff                                @@
##           premium-upgrade/PM-33517-settings-premium_bak    #6795      +/-   ##
=================================================================================
+ Coverage                                          85.66%   85.72%   +0.06%     
=================================================================================
  Files                                                831      828       -3     
  Lines                                              59011    58979      -32     
  Branches                                            8633     8634       +1     
=================================================================================
+ Hits                                               50553    50562       +9     
+ Misses                                              5468     5427      -41     
  Partials                                            2990     2990              

Flag	Coverage Δ
app-data	17.40% <100.00%> (+0.01%)	⬆️
app-ui-auth-tools	20.25% <0.00%> (-0.01%)	⬇️
app-ui-platform	15.75% <0.00%> (-0.01%)	⬇️
app-ui-vault	25.83% <0.00%> (-0.01%)	⬇️
authenticator	6.53% <0.00%> (+0.02%)	⬆️
lib-core-network-bridge	4.26% <0.00%> (-0.01%)	⬇️
lib-data-ui	1.02% <0.00%> (-0.01%)	⬇️

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