docs: cut 6.1.0 versions for docs, admin_docs, developer_docs, components

Snapshots all four versioned Docusaurus sections at v6.1.0. Built on
top of the version-cutting tooling work in chore/docs-cut-6.1.0-versions
so the snapshot benefits from:

- Auto-gen refresh before snapshotting (database pages from engine
  spec metadata, API reference from openapi.json, component pages
  from Storybook stories) — captured at the SHA we cut from rather
  than whatever happened to be on disk.
- Data-import freeze: country list, feature flag table, database
  diagnostics, and component metadata are copied into snapshot-local
  `_versioned_data/` dirs so the historical version doesn't silently
  mutate when the source files change.
- Depth-aware import-path rewriter that handles deeply-nested
  component MDX files referencing `../../../src/` from the snapshot.

Versioning behavior: `lastVersion` stays at `current` for every
section, so the canonical URLs (`/docs/...`, `/admin-docs/...`,
`/developer-docs/...`, `/components/...`) continue to render content
from master. The `current` version is consistently labeled "Next"
with an `unreleased` banner, and `6.1.0` is a historical pin
accessible only via its explicit version segment.

Component playground: previously `disabled: true` in versions-config.json,
now enabled and versioned. The plugin block in docusaurus.config.ts
was already gated only by the `disabled` flag, so no other code
changes were needed to bring it back online.

The frozen `databases.json` in the snapshot is the canonical 80-database
artifact from the latest committed state in master (preserved by the
generator's input-hash cache), not a fallback regenerated from a
local Flask environment.

docs/developer_docs_versioned_docs/version-6.1.0/api/get-a-form-data.api.mdx

@@ -0,0 +1,68 @@
+---
+id: get-a-form-data
+title: "Get a form_data"
+description: "Get a form_data"
+sidebar_label: "Get a form_data"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+sidebar_class_name: "get api-method"
+info_path: developer-docs/api/superset
+custom_edit_url: null
+hide_send_button: true
+show_extensions: true
+---
+
+import MethodEndpoint from "@theme/ApiExplorer/MethodEndpoint";
+import ParamsDetails from "@theme/ParamsDetails";
+import RequestSchema from "@theme/RequestSchema";
+import StatusCodes from "@theme/StatusCodes";
+import OperationTabs from "@theme/OperationTabs";
+import TabItem from "@theme/TabItem";
+import Heading from "@theme/Heading";
+import Translate from "@docusaurus/Translate";
+
+<Heading
+  as={"h1"}
+  className={"openapi__heading"}
+  children={"Get a form_data"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/explore/form_data/{key}"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Get a form_data
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./get-a-form-data.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./get-a-form-data.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./get-a-form-data.StatusCodes.json")}
+>
+
+</StatusCodes>