GH-2072: Add subscription interval to ping params and change UpgradePlan CTA link params

[benstrumeyer]

• Have you followed the guidelines in CONTRIBUTING.md?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you added an explanation of what your changes do?
• Does your submission pass tests?
• Did you lint your code prior to submission?

• Add subscription interval parameter to all pings, taken from the account conf variable
• 0 if the user is a free user or not signed in
• 1 if monthly
• 2 if yearly

The login ping will send a 0 regardless of subscription status. All other pings without refreshing the panel will send the updated value. Let me know if there is a way to fix this

• Change CTA param in UpgradePlanView from subscription_interval to interval to match the query param in checkout-web

Ticket: https://ghostery.atlassian.net/browse/GH-2072

[wlycdgr]

Re: the login pin always sending 0 for si - looks like we are sending the sign_in ping in the account.login message handler in background before we actually call account.login. Moving the ping into a finally handler might do the trick.