Remove experimental UI dev settings (#6814)

Task/Issue URL: https://app.asana.com/1/137249556945/project/488551667048375/task/1211392596624751?focus=true

### Description
Remove the experimental UI settings screen from dev settings

### Steps to test this PR
Go to settings -> scroll down to internal feaetures and verify that `Experimental UI Settings` is not there

Author: aitorvs

app/build.gradle

@@ -265,7 +265,6 @@ dependencies {
     implementation project(':common-utils')
     implementation project(':app-store')
     implementation project(':common-ui')
-    internalImplementation project(':common-ui-internal')
     implementation project(':di')
     implementation project(':app-tracking-api')
     implementation project(':vpn-impl')