Don't mark prebuilds with failing tasks unavailable

[csweichel]

This PR correctly marks prebuilds with a failed headless task as available, and updates ws-manager to not spuriously add the failed condition if the headless task fails.

fixes #4964

How to test

1. Run a prebuild with a failing headless task, e.g. https://csweichel-don-t-abort-prebuild-4964.staging.gitpod-dev.com#https://github.com/csweichel/test-repo/tree/task-failure
2. Check the database and find the prebuild marked as available

[csweichel]

/auto-cc

[codecov]

Codecov Report

Merging #4975 (ed9bcd7) into main (698a17b) will increase coverage by 13.32%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main    #4975       +/-   ##
===========================================
+ Coverage   23.02%   36.34%   +13.32%     
===========================================
  Files          11       13        +2     
  Lines        1915     3747     +1832     
===========================================
+ Hits          441     1362      +921     
- Misses       1415     2270      +855     
- Partials       59      115       +56     

Flag	Coverage Δ
components-ws-daemon-app	?
components-ws-manager-app	36.34% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/ws-manager/pkg/manager/status.go	72.21% <100.00%> (ø)
components/ws-daemon/pkg/content/config.go
...onents/ws-daemon/pkg/internal/session/workspace.go
components/ws-daemon/pkg/resources/dispatch.go
components/ws-daemon/pkg/resources/controller.go
components/ws-daemon/pkg/resources/limiter.go
components/ws-daemon/pkg/content/archive.go
components/ws-daemon/pkg/content/tar.go
components/ws-daemon/pkg/internal/session/store.go
components/ws-daemon/pkg/quota/size.go
... and 15 more

---

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[csweichel]

@geropl debug leftover is removed. Please have another look

[geropl]

/werft run

👍 started the job as gitpod-build-csweichel-don-t-abort-prebuild-4964.4

[geropl]

Code LGTM, tested and worked 👍

[roboquat]

LGTM label has been added.

Git tree hash: 633a975dcfd6b697616f5278363f392b12b1f86c

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csweichel, geropl

Associated issue: #4964

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Needs approval from an approver in each of these files:

• components/ws-manager/OWNERS [csweichel]
• components/ws-manager-bridge/OWNERS [csweichel,geropl]

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