DINC0774469 : Link not getting created in nested entities

[rishikunnath2747]

This pr fixes the issue where Link was not getting created in nested entities

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist before requesting a review

• I follow Java Development Guidelines for SAP
• I have tested the functionality on my cloud environment.
• I have provided sufficient automated/ unit tests for the code.
• I have increased or maintained the test coverage.
• I have ran integration tests on my cloud environment.
• I have validated blackduck portal for any vulnerability after my commit.

Integration tests

1. Single tenant : https://github.com/cap-java/sdm/actions/runs/21508076504
2. Multi tenant : https://github.com/cap-java/sdm/actions/runs/21508165217/job/61968670082

Scenarios tested

1. Create link in Books entity
2. Create link in Chapters entity