Add support for Authenticator App with opt-in flag and related config…, Fixes AB#3579566

[rohitluthra]

Add Authenticator App to android-complete (opt-in)

PBI - AB#3579566

Summary

Integrates the Microsoft Authenticator app (authenticator/PhoneFactor) into the android-complete multi-repo workspace as an opt-in module. When the opt-in flag is off (the committed default), the workspace builds exactly as it does today — no new modules, no new dependencies, no jetifier overhead. When turned on, all Authenticator modules, the AuthApp Maven feed, and Authenticator buildscript plugins (Hilt, Navigation Safe Args, etc.) are wired in.

This lets developers who don't work on Authenticator keep a lean, fast Gradle sync, while developers who do work on it get a single unified workspace.

The opt-in flag: includeAuthenticatorApp

Resolved in priority order (highest wins):

1. -PincludeAuthenticatorApp=true on the command line
2. ~/.gradle/gradle.properties (per-user, never committed)
3. local.properties (per-checkout, gitignored)
4. gradle.properties (committed default — false)

When enabling, developers must also set android.enableJetifier=true (documented inline in gradle.properties) because some Authenticator deps (Samsung Knox supportlib, MsaSdk .aar blobs) were compiled against the legacy Android Support Library.

Changes

File	Change
settings.gradle	Read includeAuthenticatorApp from local.properties → gradle property. Conditionally register the vsts-maven-authapp plugin repo and include all 28 Authenticator modules (:MSAuthenticator, :AadRemoteNgcLibrary, :MsaSdk*, :WalletLibrary*, :VerifiableCredential-*, :uiautomator-tests, etc.). :Macrobenchmark is intentionally excluded (references :app internally, not needed for local dev).
build.gradle	Resolve the opt-in flag into project.ext. When on: merge authenticator/PhoneFactor/gradle.properties into root ext, add the vsts-maven-authapp buildscript repo, and add Authenticator-required classpath deps (Hilt, Navigation Safe Args). Otherwise: behavior unchanged.
gradle.properties	Added includeAuthenticatorApp=false (default) + android.enableJetifier=false (default) with detailed inline docs. Bumped org.gradle.jvmargs heap from -Xmx2048m → -Xmx4096m to handle the larger module graph when Authenticator is enabled.
.gitconfig	git droidSetup now conditionally clones the authenticator repo (AD-MFA-phonefactor-phoneApp-android) only when the opt-in flag is on, and runs submodule init for it. All other droid* aliases (droidStatus, droidCheckout, droidPull, droidPush, droidFetch, droidBranch, droidStash, droidNewFeature, droidShowBranches, droidCheckoutDev, droidUpdateSubmodules) gate the authenticator step on the same flag using a grep guard against local.properties / gradle.properties. The authenticator working branch is working (not dev). Also resolved a merge conflict with master (design-docs clone line preserved).
.gitignore	Added Feature Orchestrator per-developer local config files (.github/developer-local.json, .github/orchestrator-config.json, .github/codebase-context.md).

How to enable locally

Add to local.properties (or ~/.gradle/gradle.properties):

includeAuthenticatorApp=true
android.enableJetifier=true

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