[SPARK-54373][UI] Enlarge the SVG viewBox attribute of Job DAG initialization

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

Enlarge the SVG viewBox attribute of Job DAG initialization from a 100*100 window to an available width of the window * 1000.

### Why are the changes needed?

improve the visualization while the graphics are being painted

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

No, the final sizes of these SVGs will be adjusted to the actual needs

### How was this patch tested?

tested in Chrome DevTools

### Was this patch authored or co-authored using generative AI tooling?
no

Closes #53087 from yaooqinn/SPARK-54373.

Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>

Author: yaooqinn

core/src/main/resources/org/apache/spark/ui/static/spark-dag-viz.js

@@ -157,7 +157,10 @@ function renderDagViz(forJob) {
   }
 
   // Render
-  var svg = graphContainer().append("svg").attr("class", jobOrStage);
+  const svg = graphContainer()
+    .append("svg")
+    .attr("class", jobOrStage)
+    .attr("viewBox", `${-VizConstants.svgMarginX} ${-VizConstants.svgMarginY} ${window.innerWidth || 1920} 1000`);
   if (forJob) {
     renderDagVizForJob(svg);
   } else {