refactor: Set expected runtime config in error message when the used disk space during the spilling process has exceeded the allocation limit (#20375)

## Which issue does this PR close?
- Closes #20373.

## Rationale for this change
Minor refactoring on error message by exposing required config name for
the end user. This is follow-up PR to both PR: #20226 and #20372 by
runtime config: `datafusion.runtime.max_temp_directory_size`.

## What changes are included in this PR?
**Current:**
```
The used disk space during the spilling process has exceeded the allowable limit of {}. Try increasing the `max_temp_directory_size` in the disk manager configuration.       
```
**New:**
```
The used disk space during the spilling process has exceeded the allowable limit of {}. \
Please try increasing the config: `datafusion.runtime.max_temp_directory_size`.",
```

## Are these changes tested?
Yes, legacy UT case has been updated by covering expected config name.

## Are there any user-facing changes?
Yes, error message has been updated which is exposed to end-users.

Author: erenavsarogullari

datafusion/core/tests/memory_limit/mod.rs

@@ -602,11 +602,16 @@ async fn test_disk_spill_limit_reached() -> Result<()> {
         .await
         .unwrap();
 
-    let err = df.collect().await.unwrap_err();
-    assert_contains!(
-        err.to_string(),
-        "The used disk space during the spilling process has exceeded the allowable limit"
-    );
+    let error_message = df.collect().await.unwrap_err().to_string();
+    for expected in [
+        "The used disk space during the spilling process has exceeded the allowable limit",
+        "datafusion.runtime.max_temp_directory_size",
+    ] {
+        assert!(
+            error_message.contains(expected),
+            "'{expected}' is not contained by '{error_message}'"
+        );
+    }
 
     Ok(())
 }

datafusion/execution/src/disk_manager.rs

@@ -420,7 +420,8 @@ impl RefCountedTempFile {
         let global_disk_usage = self.disk_manager.used_disk_space.load(Ordering::Relaxed);
         if global_disk_usage > self.disk_manager.max_temp_directory_size {
             return resources_err!(
-                "The used disk space during the spilling process has exceeded the allowable limit of {}. Try increasing the `max_temp_directory_size` in the disk manager configuration.",
+                "The used disk space during the spilling process has exceeded the allowable limit of {}. \
+                Please try increasing the config: `datafusion.runtime.max_temp_directory_size`.",
                 human_readable_size(self.disk_manager.max_temp_directory_size as usize)
             );
         }