Rename and improve Duck Player tests (#6386)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1207252092703676/task/1210787158998860?focus=true

### Description
* Mark `ask_direct_youtube_duckplayer.yaml` as `duckplayerlocal`
* Use common assertion flows in:
    * `ask_direct_youtube_youtube.yaml`
    * `direct_duckplayer.yaml`
    * `never_youtube.yaml`
* Rename `youtube_overlay_use_duckplayer.yaml` to
`ask_direct_youtube_duckplayer.yaml`
* Remove old `ask_direct_youtube_duckplayer.yaml` as it was loading Duck
Player directly instead, which was already implemented in
`direct_duckplayer_youtube.yaml`

### Steps to test this PR
- Check tests marked as `duckplayer` run in Maestro Cloud
- Check tests marked as `duckplayerlocal` run locally

Author: CrisBarreiro

.maestro/duckplayer/ask_direct_youtube_duckplayer.yaml

@@ -1,7 +1,7 @@
 appId: com.duckduckgo.mobile.android
 name: "DuckPlayer: Ask > Direct YouTube > Duck Player"
 tags:
-  - duckplayer
+  - duckplayerlocal
 ---
 - retry:
     maxRetries: 3
@@ -10,22 +10,9 @@ tags:
           clearState: true
 
       - runFlow: ../shared/skip_all_onboarding.yaml
+      - runFlow: common/load_youtube_video.yaml
 
       - tapOn:
-          id: "omnibarTextInput"
-      - inputText: "duck://player/3ml7yeKBUhc"
-      - pressKey: Enter
+          text: "Turn On Duck Player"
 
-      - extendedWaitUntil:
-          visible:
-            text: "duck://player/3ml7yeKBUhc.*"
-          timeout: 5000
-
-      - tapOn:
-          id: app
-
-      - tapOn:
-          text: "Watch on YouTube"
-
-      - runFlow: common/assert_youtube_visible.yaml
-      - runFlow: common/assert_overlay_not_shown.yaml
+      - runFlow: common/assert_duckplayer_visible.yaml

.maestro/duckplayer/ask_direct_youtube_youtube.yaml

@@ -22,10 +22,4 @@ tags:
               text: "Turn on Duck Player to watch without targeted ads"
           timeout: 5000
 
-      # Core assertion: Verify we're still on regular YouTube (not Duck Player)
-      - assertNotVisible:
-          text: "duck://player/.*"
-      
-      # Verify we're still on YouTube mobile URL
-      - assertVisible:
-          text: ".*youtube.*" 
+      - runFlow: common/assert_youtube_visible.yaml

.maestro/duckplayer/direct_duckplayer.yaml

@@ -16,10 +16,4 @@ tags:
       - inputText: "duck://player/3ml7yeKBUhc"
       - pressKey: Enter
 
-      - extendedWaitUntil:
-          visible:
-            text: "duck://player/3ml7yeKBUhc"
-          timeout: 5000
-
-      - assertNotVisible:
-          text: ".*youtube.com/watch.*"
+      - runFlow: common/assert_duckplayer_visible.yaml

.maestro/duckplayer/open_duckplayer_settings.yaml renamed to .maestro/duckplayer/duckplayer_settings.yaml

@@ -28,8 +28,4 @@ tags:
       - assertNotVisible:
           text: "duck://player/.*"
 
-      # Verify we're still on YouTube mobile URL
-      - assertVisible:
-          text: ".*youtube.*"
-
-      - runFlow: common/assert_overlay_not_shown.yaml
+      - runFlow: common/assert_youtube_visible.yaml