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

Snapshots all four versioned Docusaurus sections at v6.1.0, cut from
master after the version-cutting tooling (#39837), broken-internal-
links fix (#40102), and user_docs rename (#40171) all landed. With
the rename in place, all four sections now produce parallel-named
files at the docs/ root (no more bare `versioned_docs/` outlier).

Versioning behavior: lastVersion stays at current for every section,
so the canonical URLs (/user-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.

Snapshot includes:
- All MDX content for the four sections.
- Auto-gen captured fresh: 74 database pages (engine spec metadata),
  ~1,800 API reference files (openapi.json), 59 component pages
  (Storybook stories).
- Data imports frozen at cut time into snapshot-local _versioned_data/
  dirs:
    user_docs_versioned_docs/version-6.1.0/_versioned_data/src/data/databases.json
      (canonical 80-database diagnostics from master, preserved by the
      generator's input-hash cache)
    admin_docs_versioned_docs/version-6.1.0/_versioned_data/data/countries.json
    admin_docs_versioned_docs/version-6.1.0/_versioned_data/static/feature-flags.json
    developer_docs_versioned_docs/version-6.1.0/_versioned_data/static/data/components.json
- Import paths in deeply-nested files rewritten so they still resolve
  from one directory deeper inside the snapshot.
- developer_docs/extensions/overview.md snapshot has the FIXED
  ./mcp.md form (from #40102), so the SPA-nav 404 isn't baked into
  the 6.1.0 version.

Verified via full yarn build: exit 0, no broken links surfaced by
onBrokenLinks: throw.

docs/developer_docs_versioned_docs/version-6.1.0/api/get-an-rls.api.mdx

@@ -0,0 +1,68 @@
+---
+id: get-an-rls
+title: "Get an RLS"
+description: "Get an item model"
+sidebar_label: "Get an RLS"
+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 an RLS"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/rowlevelsecurity/{pk}"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Get an item model
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./get-an-rls.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./get-an-rls.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./get-an-rls.StatusCodes.json")}
+>
+
+</StatusCodes>