Add TestFramework files and fix Addressables coverage

* Fix incorrect comment - aa means Addressable Assets not Android Assets
* Add more complete default Addressables coverage
* Add TestRunner package generated files

Author: mikerochip

Unity.gitignore

@@ -74,12 +74,18 @@ mono_crash.*
 # Crashlytics generated file
 crashlytics-build.properties
 
-# Packed Addressables
-/[Aa]ssets/[Aa]ddressable[Aa]ssets[Dd]ata/*/*.bin*
-
-# Temporary auto-generated Android Assets
-/[Aa]ssets/[Ss]treamingAssets/aa.meta
-/[Aa]ssets/[Ss]treamingAssets/aa/*
+# TestRunner generated files
+InitTestScene*.unity*
+
+# Addressables default ignores, before user customizations
+/ServerData
+/[Aa]ssets/StreamingAssets/aa*
+/[Aa]ssets/AddressableAssetsData/link.xml*
+/[Aa]ssets/Addressables_Temp*
+# By default, Addressables content builds will generate addressables_content_state.bin
+# files in platform-specific subfolders, for example:
+# /Assets/AddressableAssetsData/OSX/addressables_content_state.bin
+/[Aa]ssets/AddressableAssetsData/*/*.bin*
 
 # Visual Scripting auto-generated files
 /[Aa]ssets/Unity.VisualScripting.Generated/VisualScripting.Flow/UnitOptions.db