Add full params on first addons purchase

What does this MR do and why?

Purchase CI minutes fail when the namespace doesn't have a active subscription or already had addon purchase. This MR updates params that are sent in this case.

Related to #345674 (closed)

Screenshots or screen recordings

How to set up and validate locally

Before validating you'd need to start CustomersDot locally

1. Run rails c
2. Run Feature.enable(:new_route_ci_minutes_purchase) to enable the feature flag for CI Minutes flow
3. Create a new group without subscription
4. Navigate to Settings -> Usage Quotas -> Pipelines tab and click OR fast forward http://localhost:5000/-/subscriptions/buy_minutes?selected_group=<selected_group_id>
5. Complete the flow

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.