Paid Chatwoot Cloud accounts now receive Captain V2 during plan
reconciliation unless they are explicitly held on Captain V1. Older
accounts could otherwise start on V1 when they became paid after the V2
rollout because only newly created accounts carried the rollout
eligibility value.
## Closes
No linked issue.
## How to reproduce
1. Start with a cloud account created before the Captain V2 rollout.
2. Upgrade the account from the default plan to a paid plan.
3. Reconcile the Stripe subscription.
4. Confirm that Captain is enabled but Captain V2 remains disabled.
## What changed
1. Treat a missing rollout eligibility value as eligible for Captain V2
on paid plans.
2. Keep Captain V2 disabled when the rollout eligibility value is
explicitly set to false.
3. Keep the default plan behavior unchanged.
4. Update the billing reconciliation specs to cover existing paid
accounts, new accounts, and explicit V1 exceptions.
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