Better process tasks.before in gitpod.yml

Currently, we defined before as

before: Use this for tasks that need to run before init and before command. For example, customize the terminal or install global project dependencies.

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When user starts a workspace with prebuild and task only with before and command

• Prebuild will run before(prebuild)
• Workspace will load prebuild result
• Workspace will run before(run)
• Workspace will run command(run)

But logs order is before(run) > before(prebuild) > command(run)

And that confused users

Proposal

• Do not run before if there is no init command in prebuild, this will make before more like its define
• Make the order of output assign to tasks exec order

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Start with the gitpod.yml task configuration and trace the execution path for before, init, and command during prebuild and workspace startup. Reproduce the log order described in the issue and inspect any existing tests for task execution. Done means before is skipped when the prebuild has no init command and output order matches execution order.