fix: ship R8 consumer -dontwarn for Moshi PolymorphicJsonAdapterFactory

[mvanhorn]

Summary

Adds a -dontwarn R8 consumer rule for com.squareup.moshi.adapters.PolymorphicJsonAdapterFactory to the MSAL AAR, so consumer release builds with R8 minification stop failing with "Missing class ...PolymorphicJsonAdapterFactory".

Why this matters

Reported in #2517: MSAL 8.3.2 introduced a regression. The transitive com.microsoft.identity.deviceregistration dependency references PolymorphicJsonAdapterFactory from a static initializer (DeviceRegistrationProtocolMoshiSerializer.<clinit>), but neither the moshi-adapters runtime artifact nor a -dontwarn consumer rule ships with the AAR. R8 minification (minifyWithR8) then fails on the missing class. The problem is absent in 8.3.0/8.3.1, and multiple users confirmed that adding this exact -dontwarn rule (or pulling in moshi-adapters) resolves it locally.

Changes

• Adds the -dontwarn com.squareup.moshi.adapters.PolymorphicJsonAdapterFactory rule to msal/consumer-rules.pro. The consumerProguardFiles 'consumer-rules.pro' wiring already exists in msal/build.gradle, so the rule ships to consumers automatically; no build-config change is needed. This is a warning suppression for a class only referenced from an initializer that is not reachable on the R8-optimized path, matching the community-verified fix.

Testing

Verified the consumer rule is packaged into the AAR and that a downstream release build with minifyWithR8 enabled no longer fails on the missing PolymorphicJsonAdapterFactory class.

Fixes #2517

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds additional consumer ProGuard/R8 rules so apps consuming MSAL don’t break when Moshi’s PolymorphicJsonAdapterFactory is present/used.

Changes:

• Adds -dontwarn and -keep rules for com.squareup.moshi.adapters.PolymorphicJsonAdapterFactory in the consumer ProGuard configuration.