[SPARK-54565][CORE] SparkBuildInfo should load spark-version-info.properties from its own classloader

### What changes were proposed in this pull request?

Change SparkBuildInfo to use its own classloader instead of thread context classloader to load `spark-version-info.properties`.

### Why are the changes needed?

I hit an issue during the Connect JDBC driver & JetBrains DataGrip integration.
```
2025-11-25 18:48:09,475 [  55114]   WARN - #c.i.d.d.BaseDatabaseErrorHandler$MissingDriverClassErrorInfo - Exception org.apache.spark.SparkException: Could not find spark-version-info.properties [in thread "RMI TCP Connection(3)-127.0.0.1"]
java.lang.ExceptionInInitializerError: Exception org.apache.spark.SparkException: Could not find spark-version-info.properties [in thread "RMI TCP Connection(3)-127.0.0.1"]
	at org.apache.spark.SparkBuildInfo$.<clinit>(SparkBuildInfo.scala:35)
	at org.apache.spark.sql.connect.client.SparkConnectClient$.org$apache$spark$sql$connect$client$SparkConnectClient$$genUserAgent(SparkConnectClient.scala:978)
	at org.apache.spark.sql.connect.client.SparkConnectClient$Configuration$.apply$default$8(SparkConnectClient.scala:999)
	at org.apache.spark.sql.connect.client.SparkConnectClient$Builder.<init>(SparkConnectClient.scala:683)
	at org.apache.spark.sql.connect.client.SparkConnectClient$.builder(SparkConnectClient.scala:676)
	at org.apache.spark.sql.connect.client.jdbc.SparkConnectConnection.<init>(SparkConnectConnection.scala:31)
	at org.apache.spark.sql.connect.client.jdbc.NonRegisteringSparkConnectDriver.connect(NonRegisteringSparkConnectDriver.scala:36)
	at com.intellij.database.remote.jdbc.helpers.JdbcHelperImpl.connect(JdbcHelperImpl.java:786)
	at com.intellij.database.remote.jdbc.impl.RemoteDriverImpl.connect(RemoteDriverImpl.java:47)
```

After adding some debug messages, I found it was caused by using wrong classloader.

```
c.i.e.r.RemoteProcessSupport - ContextClassLoader: com.intellij.database.remote.jdbc.impl.JdbcClassLoader$1559cc356
c.i.e.r.RemoteProcessSupport - SparkBuildInfo ClassLoader: com.intellij.database.remote.jdbc.impl.JdbcClassLoader$JdbcClassLoaderImpl62e93ea8
```

Similar issue that affects Hive JDBC driver and Spark's Isolated Classloader (see SPARK-32256) was fixed by [HADOOP-14067](https://issues.apache.org/jira/browse/HADOOP-14067)

### Does this PR introduce _any_ user-facing change?

This fixes corner issues that the application uses multiple classloaders with Spark libs.

### How was this patch tested?

Pass GHA to ensure the change breaks nothing, also manually verified the Connect JDBC driver & JetBrains DataGrip integration.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #53279 from pan3793/SPARK-54565.

Lead-authored-by: Cheng Pan <chengpan@apache.org>
Co-authored-by: Cheng Pan <pan3793@gmail.com>
Signed-off-by: yangjie01 <yangjie01@baidu.com>
(cherry picked from commit 095c2c3)
Signed-off-by: yangjie01 <yangjie01@baidu.com>

Author: pan3793

common/utils/src/main/scala/org/apache/spark/SparkBuildInfo.scala

@@ -29,8 +29,8 @@ private[spark] object SparkBuildInfo {
     spark_build_date: String,
     spark_doc_root: String) = {
 
-    val resourceStream = Thread.currentThread().getContextClassLoader.
-      getResourceAsStream("spark-version-info.properties")
+    val resourceStream = getClass.getClassLoader
+      .getResourceAsStream("spark-version-info.properties")
     if (resourceStream == null) {
       throw new SparkException("Could not find spark-version-info.properties")
     }