crypto: reject unintended raw key format string input

[panva]

As originally intended, raw formats !== strings.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/72935/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.64%. Comparing base (21436f0) to head (2682a82).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62974      +/-   ##
==========================================
- Coverage   89.66%   89.64%   -0.02%     
==========================================
  Files         706      706              
  Lines      219391   219409      +18     
  Branches    42068    42079      +11     
==========================================
- Hits       196712   196699      -13     
- Misses      14578    14613      +35     
+ Partials     8101     8097       -4     

Files with missing lines	Coverage Δ
lib/internal/crypto/keys.js	96.90% <100.00%> (ø)

... and 48 files with indirect coverage changes

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