docs: cut 6.1.0 versions for 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) and broken-internal-
links fixes (#40102) landed. Captures fresh auto-generated content and
freezes data dependencies so the historical snapshot stays correct.

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.

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:
    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.

Verified via full yarn build: exit 0, no broken links surfaced by
onBrokenLinks: throw. Anchor warnings present are pre-existing on
master (community#superset-community-calendar) and unrelated.

docs/developer_docs_versioned_docs/version-6.1.0/api/schemas/chartdataresponseschema.Schema.json

@@ -0,0 +1 @@
+{"schema":{"properties":{"result":{"description":"A list of results for each corresponding query in the request.","items":{"properties":{"annotation_data":{"description":"All requested annotation data","items":{"additionalProperties":{"type":"string"},"type":"object"},"nullable":true,"type":"array"},"applied_filters":{"description":"A list with applied filters","items":{"type":"object"},"type":"array"},"cache_key":{"description":"Unique cache key for query object","nullable":true,"type":"string"},"cache_timeout":{"description":"Cache timeout in following order: custom timeout, datasource timeout, cache default timeout, config default cache timeout.","nullable":true,"type":"integer"},"cached_dttm":{"description":"Cache timestamp","nullable":true,"type":"string"},"colnames":{"description":"A list of column names","items":{"type":"string"},"type":"array"},"coltypes":{"description":"A list of generic data types of each column","items":{"type":"integer"},"type":"array"},"data":{"description":"A list with results","items":{"type":"object"},"type":"array"},"detected_currency":{"default":null,"description":"Detected ISO 4217 currency code when AUTO mode is used. Returns the currency code if all filtered data contains a single currency or null if multiple currencies are present.","nullable":true,"type":"string"},"error":{"description":"Error","nullable":true,"type":"string"},"from_dttm":{"description":"Start timestamp of time range","nullable":true,"type":"integer"},"is_cached":{"description":"Is the result cached","type":"boolean"},"queried_dttm":{"description":"UTC timestamp when the query was executed (ISO 8601 format)","nullable":true,"type":"string"},"query":{"description":"The executed query statement. May be absent when validation errors occur.","nullable":true,"type":"string"},"rejected_filters":{"description":"A list with rejected filters","items":{"type":"object"},"type":"array"},"rowcount":{"description":"Amount of rows in result set","type":"integer"},"stacktrace":{"description":"Stacktrace if there was an error","nullable":true,"type":"string"},"status":{"description":"Status of the query","enum":["stopped","failed","pending","running","scheduled","success","timed_out"],"type":"string"},"to_dttm":{"description":"End timestamp of time range","nullable":true,"type":"integer"}},"required":["cache_key","cache_timeout","cached_dttm","is_cached","queried_dttm"],"type":"object","title":"ChartDataResponseResult"},"type":"array"}},"type":"object","title":"ChartDataResponseSchema"},"schemaType":"response"}