* refactor asserting plan generation in plans_test.exs

* stop grandfathering old expired trials

For users who registered before the business tiers release, we want to
offer a chance to subscribe to a grandfathered plan. However, if they
let their trial expire and don't subscribe in the next 10 days, they'll
lose that opportunity.

* stop grandfathering expired subscriptions

* remove default title and icon from Generic.notice

* fix bug with dismissable notice

classList is null when dismissable_id is not given

* alias Plausible.Auth.User

* Refactor Generic.notice component

Make it easy to apply different colors

* move subscription_cancelled_notice across the app

And remove from user settings > subscription box. Also, include a note
about losing grandfathered status when letting the subscription expire.

* allow full width in Generic.notice

* use Generic.notice for subscription_past_due_notice

* use Generic.notice for subscription_paused_notice

* prevent two notices clashing into each other with gap-y-2

* define attrs for phx components

* optimize for light mode

* make subscription cancelled notice dismissable

but if it's dismiss, show it in the place where it was before in the
account settings > subscription box

* make function private

* replace function doc with regular comment to avoid compile warning

* use array for classnames

Co-authored-by: Vinicius Brasil <vini@hey.com>

* fix typos in function doc

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Co-authored-by: Vinicius Brasil <vini@hey.com>