Update CODEOWNERS in BigBang for Velero

remove @jcarnes add @toladipupo

added BB Documentation Standards kinddocs velero labels

changed milestone to %1.15.0

changed iteration to Big Bang Iterations Aug 10, 2021 - Aug 23, 2021

added Good First Issue label

set weight to 1

added statusreview label

removed statusreview label

assigned to @micah.nagel

added statusdoing label

mentioned in merge request !757 (merged)

added statusreview label and removed statusdoing label

closed with merge request !757 (merged)

mentioned in commit b98983b1

removed statusreview label