fix: Merge appregdefs from template and instance repo

[chethana-shastry-p]

Pull Request

Summary

For copying Application and Registry definitions:
Current implementation:

1. Existing AppDefs and RegDefs folders are deleted completely.
2. Rendered AppDefs and RegDefs folders from the template repository are then copied over.
   Hotfix behavior:
3. Do not delete the existing folders.
4. Simply copy the rendered AppDefs and RegDefs folders from the template repository into the target location.
   Result:
5. Existing .yml or .yml files will remain if they are not present in the template repository.
6. If a file with the same name exists in both places, the file from the template repository will overwrite the existing one.
   Note: If a file was present in template repository and deleted later in subsequent runs, it'll still remian in instance repository.

Issue

Breaking Change?

• Yes
• No

Scope / Project

appregdef rendering

Implementation Notes

Provide details on how the change was implemented, including any technical considerations, trade-offs, or notable design decisions. Leave blank if not applicable.

Tests / Evidence

• Tests added

Additional Notes