[ubp] allow usage of team without stripe sub

[svenefftinge]

Description

This change removes the requirement for a team to have an active stripe subscription in order to see their balance and start workspaces.

It only depends on whether they have credits available. This change allows to grant a spending limit and/or credits to teams that are still on the internal other strategy.

Related Issue(s)

Fixes #15137

How to test

Release Notes

NONE

Documentation

Werft options:

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-payment
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

[werft-gitpod-dev-com]

started the job as gitpod-build-sefftinge-ubp-unbilled-teams-with-15137.1 because the annotations in the pull request description changed
(with .werft/ from main)

[easyCZ]

LGTM

[jankeromnes]

Thanks @svenefftinge!

So I guess we now always show the "Balance" UI also for Teams (even when they don't have any credits):

0 credit limit (default for teams without sub)	credit limit almost used up

Side note: This is a pre-existing change, but I still have a hard time reading the "reverse progress bar" that's showing "remaining balance" instead of just "credits consumed".

• When the credit limit is 0, it shows a full progress bar (i.e. "everything remains"), while I would expect an empty progress bar instead (i.e. "nothing remains")
• Also, over time as you consume credits, the progress bar goes from full to empty, i.e. it "shrinks" from right to left 🙈 I find this super confusing

---

So, the new supported behavior with this PR is:

1. Take a team without a Stripe subscription
2. Increase its monthly limit via Admin
3. The team is now able to take attribution for its own projects 🙌

Caveats:

• Still, once a team has an altered limit, users can not default their own attribution to that team in their /billing section (teams still need a subscription to be a default attribution)
• Also, once your altered team has reached its limit, you can still start new workspaces for that team's project -- it's just that the new workspaces will silently re-attribute to the user instead of the team (I found that a little confusing)

/hold for the caveats, but approving because this works as advertised and allows granting more resources to a team

Cc @jldec and @gtsiolis because this makes Team Billing always show the "Balance" UI, even when they don't have a subscription (small UX change)

[svenefftinge]

/unhold

will take care of the caveats in follow up