* Image builds in prebuilds UI
* update java gitignore
* Introduce a public API `watchWorkspaceImageBuildLogs`
* Use papi impl in prebuild logs
* Special case for missing prebuild tasks
* Add route handler for image build logs
* remove the papi method
* 404 if nothing was written
* remove unused converter changes
* update golden files
* Remove unused hook
* reset backoff when imagebuild logs are not ready
* Handle unavailable logs better
* revert adding unused dep
* Fix test
* Do not use `null`s and refactor disposables
* revert disposable changes
* Add gero's comments
Co-authored-by: Gero Posmyk-Leinemann <gero@gitpod.io>
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Co-authored-by: Gero Posmyk-Leinemann <gero@gitpod.io>
