fix(go): QueryValuesWithDefaults handles nil inputs

[patrickthornton]

Description

QueryValuesWithDefaults used to panic when receiving a nil input, but doesn't now.

Changes Made

This change also does some considerable Go as-is file maintenance:

1. Moves almost all of the remaining as-is files to v2 generation and deleting them in v1 (so it shouldn't be confusing where to make edits for most of these files now).
2. Deletes the go/internal/testdata snapshots, which appear to be indicative of an old snapshot testing routine now outmoded by seed.
3. Standardizes to the use of any over the use of interface{} in as-is files.

Testing

Added a small extra test to query_test.go to test nil inputs; plus seed.

[github-actions]

🌱 Seed Test Selector

Select languages to run seed tests for:

• Python
• TypeScript
• Java
• Go
• Ruby
• C#
• PHP
• Swift
• Rust
• OpenAPI
• Postman

---

How to use: Click the ⋯ menu above → "Edit" → check the boxes you want → click "Update comment". Tests will run automatically and snapshots will be committed to this PR.