Tasks log output is too chatty (especially with prebuilds enabled)

Bug description

When my project has a .gitpod.yml that looks like this (each command prints nothing itself):

tasks:
  - before: BEFORE
    init: INIT
    prebuild: PREBUILD

And then I open a prebuilt workspace for my project, I would expect the first Terminal to show something like this:

gitpod /workspace/project $ { BEFORE } && { INIT } && { PREBUILD }

🤙 This task ran as a workspace prebuild

However, currently, the first Terminal shows all this stuff:

 HISTFILE=/workspace/.gitpod/cmd-0 history -r; {
BEFORE
} && {
[ -r /workspace/.prebuild-log-0 ] && cat /workspace/.prebuild-log-0; [ -r /workspace/.gitpod/prebuild-log-0 ] && cat /workspace/.gitpod/prebuild-log-0; true
}
gitpod /workspace/project $  HISTFILE=/workspace/.gitpod/cmd-0 history -r; {
> BEFORE
> } && {
> [ -r /workspace/.prebuild-log-0 ] && cat /workspace/.prebuild-log-0; [ -r /workspace/.gitpod/prebuild-log-0 ] && cat /workspace/.gitpod/prebuild-log-0; true
> }
{
BEFORE
} && {
INIT
} && {
PREBUILD
}; exit
gitpod /workspace/project $ {
> BEFORE
> } && {
> INIT
> } && {
> PREBUILD
> }; exit
exit

🤙 This task ran as a workspace prebuild

Steps to reproduce

1. Add a simple .gitpod.yml to a project, with tasks, and enable prebuilds
2. Open a workspace for that project, and look at the first Terminal output

Expected behavior

The Terminal output should:

• Not show anything unrelated to me, the user (e.g. all these HISTFILE things, and the prebuild log catting logic)
• Only print my own commands once, not twice (INIT, PREBUILD) or 4 times (BEFORE)

Example repository

https://github.com/jankeromnes/gitpod-staging-prebuilds

Anything else?

No response

The issue names a .gitpod.yml task configuration and an example repository, but no source files or tests. Reproduce the output with before, init, and prebuild commands and trace the task/prebuild terminal handling; done means user commands appear once without internal HISTFILE or log-reading details.