OWNERS set for video files in src (ampproject#25120)

Realized that video service files are really touched when creating 3p player contributions, so they can be set to the broader ampproject/wg-ui-and-a11y group (rather than the specific set from ampproject#24908).

Added missing ownership for other video/media related files in src.

src/OWNERS

@@ -6,5 +6,9 @@
     {
       owners: [{name: 'dvoytenko'}, {name: 'ampproject/wg-runtime'}],
     },
+    {
+      pattern: '{iframe-video,mediasession-helper,video-*}.js',
+      owners: [{name: 'ampproject/wg-ui-and-a11y'}],
+    },
   ],
 }

src/service/OWNERS

@@ -0,0 +1,11 @@
+// For an explanation of the OWNERS rules and syntax, see:
+// https://github.com/ampproject/amp-github-apps/blob/master/owners/OWNERS.example
+
+{
+  rules: [
+    {
+      pattern: 'video-*.js',
+      owners: [{name: 'ampproject/wg-ui-and-a11y'}],
+    },
+  ],
+}

src/service/video/OWNERS

@@ -4,7 +4,7 @@
 {
   rules: [
     {
-      owners: [{name: 'alanorozco'}, {name: 'wassgha'}],
+      owners: [{name: 'ampproject/wg-ui-and-a11y'}],
     },
   ],
 }