Fix ORM 3 inverse-side mappings without inversedBy

[alexmart]

Summary

When using Doctrine ORM 3, ClassMetadata::getAssociationMapping() can return mapping objects for inverse-side one-to-one associations (for example OneToOneInverseSideMapping) that do not expose an inversedBy property.

FixtureFactory::resolveInversedBy() currently accesses $association->inversedBy unconditionally for object mappings, which triggers a runtime error in this case.

What this changes

• Return null when an association mapping object has no inversedBy property.
• Keep existing behavior for array mappings and owning-side mappings.
• Add a regression test that creates an entity with a single-valued inverse-side one-to-one association (Fingerprint::$device) to verify fixture creation does not fail.

Why this is safe

updateCollectionSideOfAssociation() already treats a non-string result from resolveInversedBy() as a no-op, so returning null cleanly skips back-reference updates where they are not applicable.

Verification

• vendor/bin/phpunit --configuration=test/phpunit.xml --testsuite=unit
• vendor/bin/phpunit --configuration=test/phpunit.xml --testsuite=integration
• vendor/bin/php-cs-fixer fix --config=.php-cs-fixer.php --dry-run --diff

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.24%. Comparing base (f3614de) to head (59931b0).

Files with missing lines	Patch %	Lines
src/FixtureFactory.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1641   +/-   ##
=========================================
  Coverage     99.23%   99.24%           
- Complexity      107      108    +1     
=========================================
  Files            28       28           
  Lines           393      395    +2     
=========================================
+ Hits            390      392    +2     
  Misses            3        3           

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