chore(build): Upgrade Maven Wrapper script to 3.3.4 and managed Maven version to 3.9.12

[rhusar]

Mainly removed the binary from SCM that I detest.

Summary by Sourcery

Upgrade the Maven Wrapper to the latest script-based implementation and update the managed Maven distribution version.

Build:

• Update Maven Wrapper scripts for Unix and Windows to wrapper version 3.3.4 and rely on script-only distribution instead of the Java downloader JAR.
• Bump the Maven distribution used by the wrapper from 3.9.8 to 3.9.12 and remove the previously committed MavenWrapperDownloader.java helper.

[sourcery-ai]

Reviewer's Guide

Updates the Maven wrapper to v3.3.4 with an "only-script" setup that no longer checks in the wrapper JAR, replaces both mvnw and mvnw.cmd with the new upstream scripts, bumps the managed Maven distribution to 3.9.12, and deletes the legacy Java-based wrapper downloader.

Sequence diagram for the updated Maven wrapper execution flow

sequenceDiagram
  actor Developer
  participant mvnw as mvnw_script
  participant Props as maven_wrapper_properties
  participant Repo as RemoteMavenRepo
  participant Cache as MavenDistributionCache
  participant Maven as MavenExecutable

  Developer->>mvnw: run mvnw [goals]
  mvnw->>Props: read distributionUrl, distributionSha256Sum
  mvnw->>Cache: check existing MAVEN_HOME for distributionUrl
  alt distribution present
    mvnw->>Maven: exec $MAVEN_HOME/bin/mvn [goals]
    Maven-->>Developer: build output
  else distribution missing
    mvnw->>Repo: download Maven distribution (zip/tar.gz)
    mvnw->>mvnw: optionally validate SHA-256
    mvnw->>Cache: extract distribution under ~/.m2/wrapper/dists
    mvnw->>Maven: exec new $MAVEN_HOME/bin/mvn [goals]
    Maven-->>Developer: build output
  end

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Flow diagram for Maven wrapper bootstrap without checked-in JAR

flowchart TD
  A[Developer runs mvnw or mvnw.cmd] --> B[Read .mvn/wrapper/maven-wrapper.properties]
  B --> C{Existing MAVEN_HOME for distributionUrl?}
  C -->|Yes| D[Resolve MAVEN_HOME in ~/.m2/wrapper/dists]
  D --> E[Invoke MAVEN_HOME/bin/mvn or mvnd]
  E --> F[Execute build]

  C -->|No| G[Create temp download directory]
  G --> H[Download Maven distribution from distributionUrl
           using wget/curl/Java or WebClient]
  H --> I{distributionSha256Sum defined?}
  I -->|Yes| J[Validate SHA-256 checksum]
  J -->|OK| K[Extract archive into temp directory]
  J -->|Failed| X[Abort: checksum validation failed]
  I -->|No| K[Extract archive into temp directory]

  K --> L[Locate extracted distribution directory]
  L --> M[Move directory under ~/.m2/wrapper/dists as MAVEN_HOME]
  M --> E
  X --> Y[Exit with error]

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File-Level Changes

Change	Details	Files
Replace Unix mvnw script with Maven Wrapper 3.3.4 shell implementation that self-downloads Maven distributions and no longer uses the Takari wrapper JAR.	Replace legacy mvnw startup script with the latest upstream 3.3.4 script including new argument parsing, Java detection, and error handling. Adopt new logic for resolving distributionUrl and optional distributionSha256Sum from maven-wrapper.properties, including mvnd support and repository URL overrides. Implement new download flow using wget, curl, or a small on-the-fly Java downloader, with checksum validation and support for zip/tar.gz artifacts. Change wrapper installation layout to ~/.m2/wrapper/dists/... with hash-based subdirectories and direct exec of the unzipped Maven binary instead of invoking the wrapper JAR.	mvnw
Replace Windows mvnw.cmd with Maven Wrapper 3.3.4 PowerShell-enhanced implementation that bootstraps Maven without the wrapper JAR.	Replace batch-only mvnw.cmd with a hybrid Batch+PowerShell script that delegates wrapper logic to PowerShell and simply invokes the resolved mvn/mvnd command. Add logic to read distributionUrl and optional distributionSha256Sum from maven-wrapper.properties, derive the appropriate mvn or mvnd command, and support MVNW_REPOURL overrides. Implement download of the Maven distribution via .NET WebClient with optional basic auth, SHA-256 validation, and extraction into the ~/.m2/wrapper/dists layout. Ensure the script finds the extracted Maven distribution directory (including snapshot cases) and outputs MVN_CMD for the batch layer to execute.	mvnw.cmd
Update Maven wrapper configuration to 3.3.4, switch to script-only mode, bump Maven distribution to 3.9.12, and remove the checked-in downloader Java class.	Update maven-wrapper.properties to set wrapperVersion=3.3.4, distributionType=only-script, and change distributionUrl to Apache Maven 3.9.12. Remove wrapperUrl property since the wrapper JAR is no longer downloaded or used in only-script mode. Delete MavenWrapperDownloader.java now that the wrapper scripts no longer rely on a Java-based downloader in the project tree.	.mvn/wrapper/maven-wrapper.properties .mvn/wrapper/MavenWrapperDownloader.java

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