test: check new WebCryptoAPI enum values

[panva]

While KeyUsage values are tested indirectly through existing tests, the raw-private value is not supported by any of the existing algorithms and as such this test change ensures that raw-private is a recognized KeyFormat value.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (e28656a) to head (cfbe37c).
⚠️ Report is 190 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #61406    +/-   ##
========================================
  Coverage   88.51%   88.52%            
========================================
  Files         703      704     +1     
  Lines      208496   208802   +306     
  Branches    40213    40321   +108     
========================================
+ Hits       184555   184838   +283     
+ Misses      15955    15951     -4     
- Partials     7986     8013    +27     

see 88 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70847/