check if user can achieve free time via clever cancellation/renewal

[chase-moskal]

• use stripe test clocks system (hack the stripeLiaison to add test_clock id (based on url in stripe dashboard of test clock) when creating a new stripe customer for the user)

1. buy a subscription -- immediately cancel it
2. fast-forward like 25 days, near the end of subscription term -- then renew it
3. check if user is charged (or prorated) for the time the subscription was cancelled

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• ultimately, we're hoping the user is charged for cancelled time (considering the user with a cancelled subscription retains the privileges until the subscription period end)
• if the user is NOT charged (or given a prorated discount for the next month), then a clever user could use cancellation/renewal as a mechanism to effectively win free time