k3d-dev holds hardcoded reference to old `ubuntu` default username

Even when providing -U ALTERNATE_USER_NAME to the quickstart script, the k3d-dev script retains a hardcoded reference to the old ubuntu user

+ sudo usermod -aG docker ubuntu
usermod: user 'ubuntu' does not exist

This prevents the quickstart/k3d-dev from completing.

changed milestone to %2.49.0

added kindbug priority3 labels

set weight to 1

assigned to @akesterson

mentioned in commit 5359f147

added statusreview label

mentioned in merge request !5888 (closed)

mentioned in commit 9e649be9

mentioned in commit a2fa1b73

mentioned in merge request !5970 (merged)

mentioned in commit 962afcb6

mentioned in commit 4005f672

closed with merge request !5970 (merged)

mentioned in commit 8e9f628b

mentioned in commit 87680696

mentioned in commit a2508130

removed statusreview label

mentioned in commit a8f927cf

mentioned in commit 22394bc0

mentioned in commit 2a9df6f7