Delete tags from search while deleting classification

[sonika-shah]

Describe your changes:

While deleting classification , we were able to still get the tags in search, this pr updates the childAlias for classification index

https://github.com/user-attachments/assets/1a42bcf2-c2bc-426a-bd1f-c1f391f9aa04

Type of change:

• [x] Bug fix
• [ ] Improvement
• [ ] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My PR title is Fixes <issue-number>: <short explanation>
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[sonarqubecloud[bot]]

Quality Gate passed for 'open-metadata-ingestion'

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

[harshach]

@sonika-shah any updates here?