[Fixes #81448830] remove call to setText when text sprite is created bec...

...ause this is before the constraint has been applied, and doing so set the text to the literal constraint string ('${this.parent.text}') rather than the computed value. It is set in the set_text setter method when the attribute is set later in the init process, so setting it early was extraneous. Added tests for the text component in text.html, moved all other smoke tests related to text into this file to keep them organized. I'd like to remove the error...html tests that are duplicated as well, but waiting to discuss with team b4 going forward. Also added labelbutton.html smoke test, as this component exhibited the symptom addressed in this bug fix.