Enable ci_skip_require_credit_card_for_addon_ci_minutes by default

In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/77829, we
waived the credit card validation requirement for namespaces with paid
CI/CD minutes. This commit switches the default feature flag to on by
default since this seems to be working in production.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/349841

Changelog: changed

config/feature_flags/development/ci_skip_require_credit_card_for_addon_ci_minutes.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/349841
 milestone: '14.7'
 type: development
 group: group::fulfillment
-default_enabled: false
+default_enabled: true