Consolidate EC_KEY key check functions

[torben-hansen]

Description of changes:

Reduce number of code-paths to a single public key validation function that runs through required FIPS check, always.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.31%. Comparing base (ab1b674) to head (69cc5d8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crypto/fipsmodule/ec/ec_key.c	71.42%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3018   +/-   ##
=======================================
  Coverage   78.31%   78.31%           
=======================================
  Files         689      689           
  Lines      121007   121004    -3     
  Branches    16996    16993    -3     
=======================================
+ Hits        94765    94769    +4     
+ Misses      25346    25339    -7     
  Partials      896      896           

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