chore(editor): add event tracking to drawing tool (#11230)

Closes: [BS-2833](https://linear.app/affine-design/issue/BS-2833/考虑屏蔽或者降低brush-行为的采集密度)

blocksuite/affine/gfx/brush/src/brush-tool.ts

@@ -154,14 +154,6 @@ export class BrushTool extends BaseTool {
       points,
     });
 
-    this.std.getOptional(TelemetryProvider)?.track('CanvasElementAdded', {
-      control: 'canvas:draw',
-      page: 'whiteboard editor',
-      module: 'toolbar',
-      segment: 'toolbar',
-      type: CanvasElementType.BRUSH,
-    });
-
     const element = this.gfx.getElementById(id) as BrushElementModel;
 
     element.stash('points');
@@ -174,6 +166,16 @@ export class BrushTool extends BaseTool {
     this._draggingPathPressures = [e.pressure];
     this._lastPopLength = 0;
   }
+
+  override activate() {
+    this.std.getOptional(TelemetryProvider)?.track('EdgelessToolPicked', {
+      page: 'whiteboard editor',
+      module: 'global toolbar',
+      segment: 'global toolbar',
+      control: 'drawing',
+      type: CanvasElementType.BRUSH,
+    });
+  }
 }
 
 declare module '@blocksuite/block-std/gfx' {