[ci] Stop lint Maven Central traffic

[jonathanpeppers]

Summary

AGP 8.12 lint's NewerVersionAvailable check bypasses configured Gradle repositories and contacts repo1.maven.org directly, leaving five Maven Central requests in every CI build.

Disable that networked advisory only when RUNNINGONCI=true in the five Gradle modules. Local developer builds retain the version check, while CI dependency resolution remains routed through dotnet-public-maven.

Validation

• Full build completed for all four Gradle roots with a fresh Gradle cache
• All 2,026 Gradle dependency-resolver requests targeted pkgs.dev.azure.com
• Java debug traces contained zero repo1.maven.org requests
• An isolated local run with RUNNINGONCI unset still made the expected lint metadata requests

[Copilot]

Pull request overview

This PR prevents Android Gradle Plugin (AGP) 8.12 lint from making direct Maven Central (repo1.maven.org) network calls during CI by conditionally disabling the NewerVersionAvailable lint check when RUNNINGONCI=true, while preserving the advisory for local developer builds.

Changes:

• Add android { lint { ... } } configuration to disable NewerVersionAvailable only when RUNNINGONCI=true.
• Apply the same conditional lint configuration across five Gradle modules (Play extensions + Material extensions).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
source/com.google.android.play/feature.delivery.extensions/extensions-aar/build.gradle	Conditionally disables NewerVersionAvailable lint check in CI to stop Maven Central traffic.
source/com.google.android.play/core.extensions/extensions-aar/build.gradle	Extends existing lint { baseline = ... } config to also disable NewerVersionAvailable on CI.
source/com.google.android.play/asset.delivery.extensions/extensions-aar/build.gradle	Conditionally disables NewerVersionAvailable lint check in CI to stop Maven Central traffic.
source/com.google.android.material/material.extensions/extensions-aar/build.gradle	Conditionally disables NewerVersionAvailable lint check in CI to stop Maven Central traffic.
source/com.google.android.material/material.extensions/app/build.gradle	Conditionally disables NewerVersionAvailable lint check in CI to stop Maven Central traffic.

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

The lint advisory is disabled only during CI, stopping Maven Central traffic while preserving local developer behavior.