[SB][RON] Add custom text to RON demo command.

Bug: 361346412
Flag: com.android.systemui.status_bar_ron_chips
Test: `adb shell cmd statusbar demo-ron -p com.android.systemui -t 10min` ->
verify status bar chip shows with provided text
Test: verify call chips and screen share chips still work as expected
Test: atest DemoRonChipViewModelTest

Change-Id: I34a39c73f78bfe852df8b440bedd223d87e02f75