Summary by cubic

Reverts the recent transformRequest/transformResponse typing change and restores the v1.x non-generic transformer types in axios. Also removes related typing tests and simplifies test fixtures.

Description

A clear and concise description of the PR.

Use this section for review hints, explanations or discussion points.

• Summary of changes
  • Revert AxiosRequestTransformer<D> and AxiosResponseTransformer<T> to non-generic interfaces using any.
  • Revert AxiosRequestConfig<D>.transformRequest to accept non-generic transformers.
  • Remove transformer typing tests and adjust existing TS module tests.
  • Simplify fixture helpers by removing the repoRoot symlink and parameter.
• Reasoning
  • Restore v1.x compatibility and avoid downstream TypeScript friction introduced by the generic transformer types.
• Additional context
  • No runtime behavior changes. Types are returned to their pre-change shape.

Docs

Please update /docs/ to remove mentions/examples of generic transformer types and reflect the non-generic transformRequest/transformResponse signatures.

Testing

• Removed: generic transformer typing tests in both CJS and ESM suites.
• Updated: module typing tests and fixture helper calls to the new createTempFixture signature (no repoRoot).
• No new tests added. Existing module compile/type-check tests continue to validate typings.

Semantic version impact

Patch: reverts typings to the established v1.x surface without runtime changes.

^{Written for commit 2de9cc7. Summary will update on new commits. Review in cubic}