[components] Closes mozilla-mobile/android-components#1400: Add close…

… button to custom tabs

Also makes the toolbar unclickable so it can't be switching into
edit mode, and removes all other actions.

Moved the custom tab back button bitmap checking to the feature from the
CustomTabConfig since we needed to know the DisplayMetrics for the
current screen to properly compare it to the max dp value.

X-Channel-Revision: [main] mozilla-mobile/android-components@96444dd
X-Channel-Revision: [main] mozilla-mobile/fenix@d039188
X-Channel-Revision: [main] mozilla-mobile/focus-android@a9a09b1
X-Channel-Converted-Revision: [main] mozilla-mobile/firefox-android@be9fd3a

_meta/mozilla-mobile-firefox-android-android-components.json

@@ -1,6 +1,6 @@
 {
   "name": "mozilla-mobile/firefox-android/android-components",
   "revs": {
-    "main": "c4570b5cbff052aef47d89c22179f7fb43df0f56"
+    "main": "be9fd3a06afb26de96e6e19c2ea0f85dcbcfb083"
   }
 }

mozilla-mobile/android-components/components/feature/customtabs/src/main/res/values/strings.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <string name="mozac_feature_customtabs_share_dialog_title">Share via</string>
     <string name="mozac_feature_customtabs_exit_button">Return to previous app</string>
-    <string name="mozac_feature_customtabs_share_link">Share link</string>
+    <string name="mozac_feature_customtabs_share_button">Share…</string>
 </resources>