cloud: Set v2 as the default output

[codebien]

Feature Description

#3117 added a new experimental output for the cloud.

When the new experimental output is evaluated as stable based on the following conditions we should set it as the default output for the cloud.

Acceptance criteria

1. Any critical errors have been observed
2. Any negative feedback has been provided

Suggested Solution (optional)

Set 2 in the default config

k6/cloudapi/config.go

Line 179 in fcb19fb

APIVersion: null.NewInt(1, false),

Already existing or connected issues / PRs (optional)

#3117
#2954