Enable changing default editor in integration tests

[jeanp413]

Description

Enable changing default editor in integration tests

Related Issue(s)

related #3065

How to test

1. Open preview environment and login
2. In workspace cd ./test/tests/ide/
3. Run export USER_TOKEN=foo
4. Run test manually go test -v github.com/gitpod-io/gitpod/test/tests/ide/vscode -kubeconfig=/home/gitpod/.kube/config -namespace=staging-jp-set-editor-test -username=<username>
5. Open prev env dashboard and see you default ide is vscode insiders

Release Notes

NONE

[codecov]

Codecov Report

Merging #8666 (a169fb6) into main (7dd98f8) will not change coverage.
The diff coverage is n/a.

❗ Current head a169fb6 differs from pull request most recent head 35bff75. Consider uploading reports for the commit 35bff75 to get more accurate results

@@           Coverage Diff           @@
##             main    #8666   +/-   ##
=======================================
  Coverage   11.17%   11.17%           
=======================================
  Files          18       18           
  Lines         993      993           
=======================================
  Hits          111      111           
  Misses        880      880           
  Partials        2        2           

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)

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[github-actions]

⚠️ Hey reviewer! BE CAREFUL ⚠️
Review the code before opening in your Gitpod. .gitpod.yml was changed and it might be harmful.

[laushinka]

Worked as advertised.

LGTM