[server] Also re-trigger Prebuilds if the Project config has changed

[jankeromnes]

Description

Related Issue(s)

Fixes #6014

How to test

1. Add a new Project that does not have a .gitpod.yml in the repo
2. In the Configurator, add echo "First" to the init task
3. Run a Prebuild -- the Prebuild should run until it's successful
4. Without changing the configuration, try to run another Prebuild -- it should quickly stop, because the previous Prebuild is still valid
5. Now, change the init task to echo "Second" in the editor
6. Run another Prebuild -- this time, it should actually re-run a new Prebuild, and show the logs with the new config

Release Notes

Fix re-running a Prebuild with a different out-of-repo configuration

/uncc

[AlexTugarev]

/werft run

👍 started the job as gitpod-build-jx-retrigger-prebuild-config-changed.3

[AlexTugarev]

just fyi, and not related to the problem solved here, it appears to happen that a prebuilt workspace might get registered in the db but no snapshot url is set, which is basically a not available prebuild. it's clearly tricky compute that state 🙈

[AlexTugarev]

/lgtm

it works as advertised! thanks @jankeromnes

[roboquat]

LGTM label has been added.

Git tree hash: 109ffc305d652670d5e0238b2586a9b1b2860de2

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexTugarev

Associated issue: #6014

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