Modernize test resources build and deployment configuration

[mbjones]

Summary
This branch updates the d1_test_resources module to align its build, deploy, and test-resource generation flow with the current branch direction from main.

• Updates the Maven build in pom.xml to use the external SSH wagon with scpexe deployment, and points distribution management at the DataONE Maven endpoint.
• Refreshes build-related dependencies and plugin configuration in the POM, including Spring test dependencies that remain scoped to tests.
• Modernizes helper code in PackageFiles.java, ApacheDSSuiteRunner.java, KnbRecords.java, and NodeRecords.java for newer JDK compatibility and cleaner resource listing.
• Ignores local VS Code workspace metadata in .gitignore.

Validation

• mvn clean test

STILL TODO

• after review, bump version numbers from SNAPSHOT to real release
• re-run tests before release

[mbjones]

Tests are all now passing in GHA.

[mbjones]

Bumped release number, re-ran tests and all passed. Will merge and tag shortly.