generator-go-sdk - Generate date functions from ancestors

[QixiaLu]

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Description

This PR fixes date functions for multi-level discriminated types:

codeForDateFunctions used c.model.ParentTypeName (immediate parent) to find DateTime fields, while structLinesForModel uses findModelAncestry() to determine which ancestor fields to include on the struct. In 3+ level discriminated hierarchies, this mismatch causes compile errors when an intermediate parent has DateTime fields that aren't on the struct

PR Checklist

• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so, please include appropriate closing keywords below.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.

Changes to Tooling

• I have added an explanation of what my changes do and why I'd like you to include them.
• I have written new tests for my changes & updated any relevant documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges.

Testing Command(s) Used:

# e.g., go test ./tools/generator-go-sdk/...

Testing Evidence:

Relevant successful SDK builds:
https://github.com/hashicorp/pandora/actions/runs/25717383360/job/75510290144
https://github.com/hashicorp/pandora/actions/runs/25717383334/job/75510290097
https://github.com/hashicorp/pandora/actions/runs/25717383350/job/75510290055

Previous problematic Data Plane SDK builds succeeds now:

Related Issue(s)

Fixes #5369

AI Assistance Disclosure

• AI Assisted - This contribution was made by, or with the assistance of, AI/LLMs

Note

If this PR changes meaningfully during the course of review, please update the title and description as required.

[wuxu92]

Thanks @QixiaLu LGTM 👍