feat(testing): add new test for cli.ts

[jsjoeio]

This PR adds a test to ensure we have coverage for this block:

https://github.com/coder/code-server/blob/main/src/node/cli.ts#L358-L360

Fixes #4885

[codecov]

Codecov Report

Merging #4898 (c85ace5) into main (f9402a6) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4898      +/-   ##
==========================================
+ Coverage   69.79%   69.86%   +0.06%     
==========================================
  Files          29       29              
  Lines        1649     1649              
  Branches      363      363              
==========================================
+ Hits         1151     1152       +1     
+ Misses        424      423       -1     
  Partials       74       74              

Impacted Files	Coverage Δ
src/node/cli.ts	84.35% <0.00%> (+0.38%)	⬆️

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[github-actions]

✨ Coder.com for PR #4898 deployed! It will be updated on every commit.

• Host: https://codercom-478k7oa87-codercom.vercel.app/docs/code-server
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• Commit: c85ace5
• Workflow status: https://github.com/coder/code-server/actions/runs/1884285700