Feature/dimension group issue and unnested view issue

[laurensvancraen]

Description

1. Nullable Records: Dimensions in top-level nullable records now correctly include their parent path (e.g., ${TABLE}.product.created).
2. Unnested Views: Nested fields within unnested views now use relative paths, avoiding incorrect parent array prefixing (e.g., ${TABLE}.item_meta.id instead of ${TABLE}.order_items.item_meta.id).

I've also added and verified regression tests:

• src/tests/test_dimension_group_issue.py
• src/tests/test_unnested_view_nested_fields.py

Fixes # (issue)

Type of change

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

How Has This Been Tested?

Added two test cases which firstly resulted in failed tests, afterwards i solved the bug and the test succeeded.

• I ran pytest and all tests pass
• I added new tests for my changes

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings (I have run ruff check . and ruff format .)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[edgardevo]

Remove name = "main" check.

see the other tests for reference