test: skip BuildTests.BasicBuildTest on Linux editors

BuildPlayer in BasicBuildTest hangs past the job timeout on the ubuntu CI agents, for both 6000.7 and
trunk, while Windows and macOS pass. The same timeouts happen on the develop-3.x.x nightly. Ignored on
Linux editors only, as a temporary measure until the ubuntu CI issue is resolved.

Author: NoelStephensUnity

com.unity.netcode.gameobjects/Tests/Editor/Build/BuildTests.cs

@@ -15,6 +15,10 @@ internal class BuildTests
         // Increased the Build test timeout from 3 to 10 minutes.
         [Timeout(900000)]
         [Test]
+#if UNITY_EDITOR_LINUX
+        // Temporary: BuildPlayer hangs past the job timeout on the ubuntu CI agents (6000.7 and trunk), while Windows and macOS pass.
+        [Ignore("BuildPlayer hangs on the ubuntu CI agents; temporarily disabled on Linux editors until the ubuntu CI issue is resolved.")]
+#endif
         public void BasicBuildTest()
         {
             var execAssembly = Assembly.GetExecutingAssembly();