Revamped Cancellation Flow

Parent Issue: https://github.com/influxdata/ui/issues/2345

We have a new Cancellation Flow which needs some finishing touches but the details are being populated in this doc: https://docs.google.com/document/d/1DM54OmPaDZskfLpqwn1J412ngDuhhTERgybHdO1xTXo/edit

Question and dropdown field content here: https://docs.google.com/document/d/1reVivSO7eV_DAv9L12iJrkuDsFGM4IyMamITjV0x2Hs/edit

In essence, we need to be able to track which users click on the `Cancel Organization` button and which users actually go through the cancellation. Both of these are separate metrics and need to be reported individually. We are also adding a mandatory form before cancelling the account so that we can know the reasons for the cancellations. In future we might be able to add some help/documentation which **might** help us retain some of the users. The form below will basically be moved to before the cancellation.

This form used to be marketo but moving forward, we will be reporting this data to Snowflake through Rudderstack instead. For this, we just need to start using rudderstack js library and the rest of the setup is already in place in our `UI` codebase. For reporting the required data, we will be using `track` event/function provided by the rudderstack library.