Java: Add integration test to reproduce regression

[IdrissRio]

See internal pR

[Copilot]

Pull Request Overview

This PR adds an integration test to reproduce a regression related to Maven wrapper projects that are missing properties files. The test sets up a minimal Java project with Maven wrapper scripts but intentionally omits the Maven wrapper properties file to trigger the regression scenario.

• Creates a new integration test case for Maven wrapper missing properties scenario
• Sets up a minimal Java "Hello World" project with Maven configuration
• Includes Maven wrapper scripts (mvnw and mvnw.cmd) without the properties file

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test.py	Defines the integration test function that creates a CodeQL database using autobuild mode
Hello.java	Simple Java class with main method for the test project
source_archive.expected	Expected files to be included in the source archive after database creation
pom.xml	Maven project configuration with basic compiler setup
mvnw.cmd	Windows Maven wrapper script that handles Maven execution and jar downloading
mvnw	Unix/Linux Maven wrapper script with similar functionality to the Windows version

[smowton]

Test looks sensible. Ideally we would verify mvnw is / isn't used as expected, but the other maven-wrapper tests are similarly just probing for a crash, so there's no immediate need to make that improvement now.