Removing Invocation of Saint Traft or the enchanted creature from the battlefield won’t stop the delayed triggered ability from exiling the Angel token at end of combat.

Although the token is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example).

You declare which player or planeswalker the token is attacking as you put it onto the battlefield. It doesn’t have to be the same player or planeswalker the enchanted creature is attacking.

If an effect gives the token vigilance, the token will still enter the battlefield tapped.