Regenerate stale codegen artifacts (#5478)

Brings committed generator outputs back in sync with their inputs; a
fresh generate is now a no-op.

What had drifted:
- OpenAPI annotations against the current `.codegen/_openapi_sha` (#5361
advanced the sha but didn't re-run the extraction, which needs
`DATABRICKS_OPENAPI_SPEC`), adding the new Vector Search Index resource
and propagating to `jsonschema.json`, `jsonschema_for_docs.json`, bundle
docs, and pydabs models.
- `bundle/internal/tf/schema` against the pinned provider (v1.117.0,
bumped in #5421).
- `bundle/terraform_dabs_map/generated.go`.

Other generators (genkit, refschema, validation, direct engine,
schema-map) produced no diff. The Taskfile gap that let the annotations
go stale is intentional (placeholder/human-curation workflow) and will
be addressed separately.

This pull request and its description were written by Isaac.

Author: pietern