Fix :qa Task Using Broken BwC Versions Resolution

I think we missed this spot in elastic#56206 breaking the task and thus Gradle imports into Idea.

Author: original-brownbear

buildSrc/src/main/java/org/elasticsearch/gradle/test/DistroTestPlugin.java

@@ -291,8 +291,7 @@ private static TaskProvider<Copy> configureCopyUpgradeTask(Project project, Vers
             Path upgradePath = upgradeDir.get().getAsFile().toPath();
 
             // write bwc version, and append -SNAPSHOT if it is an unreleased version
-            ExtraPropertiesExtension extraProperties = project.getExtensions().getByType(ExtraPropertiesExtension.class);
-            BwcVersions bwcVersions = (BwcVersions) extraProperties.get("bwcVersions");
+            BwcVersions bwcVersions = BuildParams.getBwcVersions();
             final String upgradeFromVersion;
             if (bwcVersions.unreleasedInfo(upgradeVersion) != null) {
                 upgradeFromVersion = upgradeVersion.toString() + "-SNAPSHOT";