By Matt Audilet Jason Tatum and the Boston Celtics failed to capitalize in a potential series-ending Game 6 against the Miami Heat on Friday night. Now, they’ll have to get the job done in Miami if they want to punch their ticket to the 2022 NBA Finals. After the 111-103 loss in the TD Garden, Tatum was asked to gauge his confidence level heading into Game 7. The Celtics star ranks his confidence as a 10 out of 10. Tatum logged a team-high 30 points, nine rebounds and four assists in last night’s loss. Ultimately, he and the Celtics were simply outplayed by Jimmy Butler, who dropped an incredi…