core/validatorapi: propose v1 and v2 returns 404

[pinebit]

Endpoints produce_block and produce_blinded_block must return 404 explicitly to prevent processing as proxy calls. Because previously we removed these from the router.
Also, this ensures all attempts to call these endpoint will increment core_validatorapi_request_error_total counter.

category: feature
ticket: #1255

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.77%. Comparing base (82d6f70) to head (9a0f636).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3167      +/-   ##
==========================================
+ Coverage   56.65%   56.77%   +0.11%     
==========================================
  Files         208      208              
  Lines       29202    29221      +19     
==========================================
+ Hits        16545    16589      +44     
+ Misses      10828    10807      -21     
+ Partials     1829     1825       -4     

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