fix: Integrate front-end jest tests with datadog reporting

[bryphe-coder]

Fixes #244

• Adds jest-junit
• Configures jest-junit to output junit.xml in site/test_results
• Uploads the emitted junit.xml to datadog as part of the test/js workflow

[kylecarbs]

So cool!

[codecov]

Codecov Report

Merging #286 (c59a8cc) into main (c5eed90) will increase coverage by 3.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   65.24%   68.32%   +3.08%     
==========================================
  Files          62      126      +64     
  Lines         679     6898    +6219     
  Branches       69       69              
==========================================
+ Hits          443     4713    +4270     
- Misses        222     1707    +1485     
- Partials       14      478     +464     

Flag	Coverage Δ
unittest-go-macos-latest	66.62% <ø> (?)
unittest-go-ubuntu-latest	67.77% <ø> (?)
unittest-go-windows-latest	66.41% <ø> (?)
unittest-js	65.24% <ø> (ø)

Impacted Files	Coverage Δ
cryptorand/numbers.go	46.90% <0.00%> (ø)
cli/projects.go	76.27% <0.00%> (ø)
cli/projectcreate.go	52.40% <0.00%> (ø)
httpapi/httpapi.go	68.11% <0.00%> (ø)
httpmw/provisionerjobparam.go	78.37% <0.00%> (ø)
database/postgres/postgres.go	70.73% <0.00%> (ø)
coderd/files.go	74.46% <0.00%> (ø)
coderd/provisionerdaemons.go	57.23% <0.00%> (ø)
coderd/projectimport.go	59.39% <0.00%> (ø)
database/time.go	0.00% <0.00%> (ø)
... and 54 more

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[bryphe-coder]

I can see the test results make it into datadog now:

So seems like this is working 🎉