test: Improvements to CI Workflow

[evansims]

Changes

This pull request updates the continuous integration workflow test.yml:

• Refine concurrency group specificity to improve efficiency. This cancels in-progress test runs when changes are committed to a pull request.
• Rename the test's Run step to Build Package for clarity to aid in filtering branch protection rules.
• Update checkout step to use github.event.pull_request.head.sha for pull_request_target (and github.ref for non-PR triggering events).
• Hardcode node-version to 18 rather than use an environment variable.

References

Updates based on internal feedback and conversations.

Testing

This pull request applies improvements to the continuous integration testing for the repository but does not add any additional tests.

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All code quality tools/guidelines have been run/followed
• All relevant assets have been compiled

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d93d513) 41.55% compared to head (00b6f89) 41.55%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2437   +/-   ##
=======================================
  Coverage   41.55%   41.55%           
=======================================
  Files         120      120           
  Lines        3025     3025           
  Branches      325      325           
=======================================
  Hits         1257     1257           
  Misses       1674     1674           
  Partials       94       94           

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