build: migrate build infrastructure from Gradle to Maven

[ramsessanchez]

Summary

Migrates the build system from Gradle to Maven, mirroring the v1 SDK migration (msgraph-sdk-java#2613), and moves CI/CD away from PAT-based Azure Artifacts auth to PAT-less MavenAuthenticate.

Changes

New Maven build

• pom.xml with all dependencies, compiler settings (Java 1.8, -parameters), jar manifest (Automatic-Module-Name), javadoc, source, and GPG signing profile
• Maven wrapper (mvnw/mvnw.cmd/.mvn) replacing the Gradle wrapper

CI/CD (PAT-less)

• gradle-build.yml → maven-build.yml (mvnw verify, Java 8 job runs mvnw compile)
• codeql-analysis.yml updated to mvnw compile + maven cache
• ADO ci-build.yml: GPG import, ~/.m2/settings.xml, MavenAuthenticate@0, mvnw install/deploy -Psigning, pom-based version, target/staging-deploy staging
• ADO daily-ci-build.yml: Maven@4 + mirror settings.xml + MavenAuthenticate@0, replacing the sed repo-stripping and $(ARTIFACTS_PAT) PAT flag

Config

• dependabot.yml: root → maven, /android kept as gradle (weekly + github-actions group preserved)
• release-please-config.json: XML xpath updater for pom.xml version
• .gitignore: Maven entries + wrapper-jar exception
• android/build.gradle: dependencies inlined (shared gradle/dependencies.gradle removed)

Removed

• All root Gradle files (build.gradle, settings.gradle, gradle.properties, gradlew, wrapper)
• java-8/ subproject (Java 8 compat now verified via Maven source/target 1.8 + JDK 8 CI job)

Verification

• ./mvnw compile — 27,817 source files compiled successfully, BUILD SUCCESS ✅

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull request overview

Migrates the repository’s build and CI infrastructure from Gradle to Maven (with Maven Wrapper), updating GitHub Actions and Azure Pipelines accordingly and removing legacy Gradle/Java-8 subproject scaffolding.

Changes:

• Introduces a root pom.xml Maven build (compiler settings, dependencies, jar/javadoc/source artifacts, signing profile) plus Maven Wrapper files.
• Updates CI pipelines (GitHub Actions + Azure Pipelines) to run ./mvnw and authenticate to Azure Artifacts via MavenAuthenticate@0 (PAT-less).
• Removes root Gradle build files and the legacy java-8/ Gradle subproject; inlines Android dependency declarations.

Reviewed changes

Copilot reviewed 22 out of 26 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
settings.gradle	Removed root Gradle settings (Gradle build no longer used).
release-please-config.json	Switches release-please version updating from gradle.properties to pom.xml via XPath.
pom.xml	Adds Maven build definition (deps, compiler config, artifacts, signing profile).
mvnw.cmd	Adds Maven Wrapper Windows launcher script.
mvnw	Adds Maven Wrapper POSIX launcher script.
java-8/settings.gradle	Removes Java-8 subproject Gradle settings.
java-8/gradle.properties	Removes Java-8 subproject Gradle properties.
java-8/daemon-jvm.properties	Removes Java-8 Gradle daemon/toolchain config.
java-8/build.gradle	Removes Java-8 subproject Gradle build script.
java-8/.gitignore	Removes Java-8 subproject Gradle ignore rules (subproject removed).
gradlew.bat	Removes Gradle Wrapper (Windows).
gradlew	Removes Gradle Wrapper (POSIX).
gradle/wrapper/gradle-wrapper.properties	Removes Gradle wrapper properties.
gradle/dependencies.gradle	Removes shared Gradle dependency catalog.
gradle.properties	Removes Gradle project properties (versioning and publishing config migrated).
build.gradle	Removes root Gradle build script (publishing/signing logic migrated).
android/build.gradle	Inlines dependencies previously pulled from gradle/dependencies.gradle.
.mvn/wrapper/maven-wrapper.properties	Adds Maven Wrapper distribution and checksum configuration.
.gitignore	Updates ignores for Maven outputs and wrapper jar handling.
.github/workflows/maven-build.yml	Replaces Gradle CI build with Maven (./mvnw verify + Java 8 compile job).
.github/workflows/codeql-analysis.yml	Updates CodeQL build step to Maven compile and Maven caching.
.github/dependabot.yml	Switches root updates to Maven; keeps Android as Gradle; preserves GitHub Actions updates.
.azure-pipelines/daily-ci-build.yml	Migrates daily Azure Pipeline build from Gradle to Maven + PAT-less feed auth and mirror settings.
.azure-pipelines/ci-build.yml	Migrates CI/release pipeline steps to Maven (install/deploy staging) + GPG import and PAT-less feed auth.

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