Throw at startup when different OpenAPI version is loaded

[bkoelman]

Closes #1808.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• N/A: Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

❌ Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.76%. Comparing base (7b1cc3a) to head (09be3b3).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...tCore/Configuration/ServiceCollectionExtensions.cs	53.84%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1819      +/-   ##
==========================================
- Coverage   92.80%   92.76%   -0.04%     
==========================================
  Files         437      437              
  Lines       14809    14821      +12     
  Branches     2388     2391       +3     
==========================================
+ Hits        13743    13749       +6     
- Misses        651      654       +3     
- Partials      415      418       +3     

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