Ignoring CodeCoverage folder

The CodeCoverage folder is generated by the Code Coverage unity package (https://docs.unity3d.com/Packages/com.unity.testtools.codecoverage@latest)

Unity.gitignore

@@ -9,6 +9,7 @@
 /[Bb]uilds/
 /[Ll]ogs/
 /[Uu]ser[Ss]ettings/
+/[Cc]ode[Cc]overage/
 
 # MemoryCaptures can get excessive in size.
 # They also could contain extremely sensitive data