[CELEBORN-2419] Fix the warning: deprecated systemProperties parameter in maven-surefire-plugin

[yew1eb]

What changes were proposed in this pull request?

Replace deprecated <systemProperties> with <systemPropertyVariables> in maven-surefire-plugin configuration in root pom.xml.

Why are the changes needed?

Maven Surefire Plugin 3.0.0-M5+ deprecated the <systemProperties> parameter. Using it produces a warning on every build:

[INFO] --- surefire:3.0.0-M7:test (default-test) @ celeborn-client_2.12 ---
[WARNING]  Parameter 'systemProperties' is deprecated: Use systemPropertyVariables instead.
[INFO] Tests are skipped.
[INFO] 
[INFO] --- surefire:3.0.0-M7:test (test) @ celeborn-client_2.12 ---
[WARNING]  Parameter 'systemProperties' is deprecated: Use systemPropertyVariables instead.
[INFO] Tests are skipped.

Does this PR resolve a correctness bug?

• Yes

Does this PR introduce any user-facing change?

• Yes

How was this patch tested?

[Copilot]

Pull request overview

Updates the root Maven build configuration to remove a Maven Surefire Plugin deprecation warning by switching to the supported configuration parameter for passing system properties to test JVMs.

Changes:

• Replaced <systemProperties> with <systemPropertyVariables> in the maven-surefire-plugin configuration in the root pom.xml.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[SteNicholas]

LGTM.

[SteNicholas]

Thanks. Merged to main(v1.0.0).