[code] codehelper exec replace process

[mustard-mh]

Description

Use syscall.Exec to improve process tree

Related Issue(s)

Fixes #

How to test

1. Use insider
2. Start a workspace
3. Run ps -efj fww, /ide/bin/gitpod-code must be direct children of supervisor

root           1       0       0       0  0 20:01 ?        Sl     0:00 supervisor init
root          26       1       0       0  0 20:01 ?        Sl     0:00 supervisor run
gitpod        47      26      47       0  0 20:01 ?        S      0:00  \_ sh /ide/bin/gitpod-code --start-server --install-builtin-extension github.vscode-pull-request-github --install-extension svelte.svelte-vscode --port 23000 --host 0.0.0.0 --without-connection-token --server-data-dir /workspace/.vscode-remote --do-not-sync

(We can remove this gitpod-code process too if we add exec to /ide/bin/gitpod-code. Or it's not necessary?)

Release Notes

NONE

Documentation

[codecov]

Codecov Report

Merging #8552 (570c5e2) into main (7ac5d9d) will decrease coverage by 1.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8552      +/-   ##
==========================================
- Coverage   12.31%   11.17%   -1.14%     
==========================================
  Files          20       18       -2     
  Lines        1161      993     -168     
==========================================
- Hits          143      111      -32     
+ Misses       1014      880     -134     
+ Partials        4        2       -2     

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)
components-ide-code-codehelper-app	∅ <ø> (?)
components-local-app-app-darwin-amd64	?
components-local-app-app-darwin-arm64	?
components-local-app-app-linux-amd64	?
components-local-app-app-linux-arm64	?
components-local-app-app-windows-386	?
components-local-app-app-windows-amd64	?
components-local-app-app-windows-arm64	?

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Impacted Files	Coverage Δ
components/local-app/pkg/auth/auth.go
components/local-app/pkg/auth/pkce.go

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[jeanp413]

We can remove this gitpod-code process too if we add exec to /ide/bin/gitpod-code. Or it's not necessary?

It's fine, gitpod-code is generated when we build vscode from this file (it gets renamed inside the gulp task)