fix(docs): always use griffe and method_page_renderer

[hkad98]

Summary

Several fixes for the V2 docs pipeline building old release branches:

1. Always use griffe_builder.py and method_page_renderer.py from the current branch instead of checking if they exist on the target branch. The scripts were always executed from the current branch anyway, and griffe does static analysis via --search-path (no imports needed). This removes the json_builder.py fallback that caused ModuleNotFoundError and the pip install -e workaround from fix(docs): install SDK packages in V2 deploy for legacy builder #1433.

2. Restore Hugo shortcode templates (parameters-block, parameter) that were deleted in the griffe pipeline commit. Old release branches have hand-written method pages using these shortcodes without api_ref frontmatter, so method_page_renderer.py skips them and Hugo needs the templates to render them.

3. Fix duplicate-named module/class pages not being generated. python_ref_builder used the leaf name as the links dict key with an if name not in links guard that skipped page creation for modules sharing a name (e.g. declarative_model exists under data_source, workspace, user, and permission). Only the first was generated.

4. Fix broken cross-links in module listings and class method tables. Used the global links dict to resolve child names, causing e.g. load_from_disk in CatalogDeclarativeDataSources to link to workspace's version. Now uses relative href="child_name/".

5. Re-enable version caching with updated cache key that includes docs/layouts/shortcodes/**.

Note on failing Netlify Deploy Preview

The Netlify Deploy Preview workflow failure is expected and not caused by this PR. That workflow (.github/workflows/netlify-deploy-preview.yaml) checks out master's docs/layouts/ directory (which doesn't have the shortcode templates yet) and only rsyncs docs/content/en/ from the PR branch. Once this PR merges to master, the preview workflow will have the restored shortcode templates and work correctly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.27%. Comparing base (e650ab3) to head (63594e9).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1436      +/-   ##
==========================================
- Coverage   77.36%   77.27%   -0.09%     
==========================================
  Files         228      227       -1     
  Lines       14775    14687      -88     
==========================================
- Hits        11430    11350      -80     
+ Misses       3345     3337       -8     

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