Expire spending limit notifications

[AlexTugarev]

and do not block on empty state.

Description

Related Issue(s)

Fixes #12094

How to test

• enable UBB on a team; set a low spending limit (e.g. 1 or 2)
• change attribution to team
• create a project
• start a couple of workspaces
• turn to the dashboard and see the notification is shown on reload (it might take a couple of tries, to get the data fly through different systems)

Release Notes

NONE

Documentation

Werft options:

• /werft with-preview
• /werft with-payment

[AlexTugarev]

/werft run

👍 started the job as gitpod-build-alex-spending-limit-notifications-12094.1
(with .werft/ from main)

[geropl]

@AlexTugarev I'm testing, and I'm not sure it works as expected:

• I set the spending limit to "1"
• I see 0,5 credits on usage view
• I see the "spending limit reached" notification
  

Is that just the delay of the usage record? Or something else at play here? 🤔 (by now my usage is beyond 1 already)

[AlexTugarev]

@geropl, this works as expected indeed! We need to align our Total usage with what we end-up computing on stripe, i.e. we need to round 🆙

[geropl]

Code LGTM, tested and works! 🎉