feat(openapi): precondition exceptions return 412

[david-leifker]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[codecov]

Codecov Report

Attention: Patch coverage is 56.09756% with 18 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...enapi/config/GlobalControllerExceptionHandler.java	0.00%	16 Missing ⚠️
.../plugins/validation/AspectValidationException.java	50.00%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (53.84%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
...gins/validation/ValidationExceptionCollection.java	100.00% <100.00%> (+53.57%)	⬆️
...a/aspect/plugins/validation/ValidationSubType.java	100.00% <100.00%> (ø)
...om/linkedin/metadata/entity/EntityServiceImpl.java	80.19% <100.00%> (+0.01%)	⬆️
.../plugins/validation/AspectValidationException.java	75.00% <50.00%> (-5.00%)	⬇️
...enapi/config/GlobalControllerExceptionHandler.java	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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