fix: Test flake for resolving instance identity auth

[kylecarbs]

https://github.com/coder/coder/runs/5457125307?check_suite_focus=true#step:7:45

[codecov]

Codecov Report

Merging #405 (2c8e8b7) into main (18c929c) will increase coverage by 2.40%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
+ Coverage   66.02%   68.42%   +2.40%     
==========================================
  Files          71      158      +87     
  Lines         774     9227    +8453     
  Branches       73       73              
==========================================
+ Hits          511     6314    +5803     
- Misses        249     2292    +2043     
- Partials       14      621     +607     

Flag	Coverage Δ
unittest-go-macos-latest	62.70% <ø> (?)
unittest-go-ubuntu-latest	67.31% <ø> (?)
unittest-go-windows-2022	62.21% <ø> (?)
unittest-js	66.02% <ø> (ø)

Impacted Files	Coverage Δ
provisioner/echo/serve.go	60.00% <0.00%> (ø)
httpmw/workspaceresourceparam.go	59.18% <0.00%> (ø)
coderd/users.go	61.53% <0.00%> (ø)
cli/users.go	100.00% <0.00%> (ø)
codersdk/workspaceresourceauth.go	62.50% <0.00%> (ø)
provisioner/terraform/provision.go	74.87% <0.00%> (ø)
codersdk/files.go	66.66% <0.00%> (ø)
cli/clitest/clitest.go	93.33% <0.00%> (ø)
pty/start_other.go	72.00% <0.00%> (ø)
httpmw/workspaceagent.go	47.36% <0.00%> (ø)
... and 77 more

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