Fix(docs): Use 'prop drilling' terminology and add glossary entry (fixes #12828) (#12862)

Resolves #12828 by updating 'state-management.md' to explicitly use the
term 'prop drilling' for the constructor-based data passing pattern,
replacing the confusing 'dependency injection' reference in that
specific context. Also adds 'Prop drilling' to the glossary.

Author: sfshaza2

src/content/get-started/fundamentals/state-management.md

@@ -157,9 +157,9 @@ Column(
 
 Passing the shared data for your app through widget constructors
 makes it clear to anyone reading the code that there are shared dependencies.
-This is a common design pattern called _dependency injection_
-and many frameworks take advantage of it or provide tools to make it easier.
-
+Creating a chain of widgets that only pass data down to their children
+is often referred to as [_prop drilling_](/resources/glossary#prop-drilling).
+ 
 ### Using InheritedWidget
 
 Manually passing data down the widget tree can be verbose

src/data/glossary.yml

@@ -178,6 +178,24 @@
     - "performance"
     - "smooth rendering"
 
+- term: "Prop drilling"
+  short_description: |-
+    The process of passing data through multiple layers of widgets
+    through constructor parameters.
+  long_description: |-
+    The process of passing data through multiple layers of widgets
+    through constructor pareameterss, usually to reach a deeper descendant.
+    This pattern can become verbose, which is
+    why other state management solutions
+    (like `InheritedWidget` or `Provider`) are often used.
+  related_links:
+    - text: "State management: Sharing state"
+      link: "/get-started/fundamentals/state-management#sharing-state-between-widgets"
+      type: "doc"
+  labels:
+    - "state management"
+    - "architecture"
+
 - term: "Sliver"
   short_description: |-
     A customizable portion of a scrollable area.