Put all text content in the node's text

Instead of just putting the state, put all the text content from the
tile. That way, the relevant services will find it. "on"/"off" is not
necessary anymore for ui tests because we use `isChecked`.

Test: manual with Talkback and Select To Speak
Test: android.platform.test.scenario.sysui.quicksettings
Bug: 261994726
Change-Id: Iea47ab940ea3e0163ba196109851ea21260af017