ESQL: Hide spatial grid functions behind SNAPSHOT (elastic#129839)

elastic#125143 added 9 spatial grid functions and released them into Serverless. We think this is not the best long-term approach and the functions in elastic#129581 are likely better.

As a first step, rmove the spatial grid functions added in elastic#125143 from release builds so they don't get released into 8.19/9.1.

---------

Co-authored-by: Craig Taverner <[email protected]>

Author: 2 people

docs/changelog/125143.yaml

@@ -10,12 +10,3 @@
   * [preview] [`ST_XMIN`](../../functions-operators/spatial-functions.md#esql-st_xmin)
   * [preview] [`ST_YMAX`](../../functions-operators/spatial-functions.md#esql-st_ymax)
   * [preview] [`ST_YMIN`](../../functions-operators/spatial-functions.md#esql-st_ymin)
-* [preview] [`ST_GEOTILE`](../../functions-operators/spatial-functions.md#esql-st_geotile)
-  * [preview] [`ST_GEOTILE_TO_STRING`](../../functions-operators/spatial-functions.md#esql-st_geotile_to_string)
-  * [preview] [`ST_GEOTILE_TO_LONG`](../../functions-operators/spatial-functions.md#esql-st_geotile_to_long)
-* [preview] [`ST_GEOHEX`](../../functions-operators/spatial-functions.md#esql-st_geohex)
-  * [preview] [`ST_GEOHEX_TO_STRING`](../../functions-operators/spatial-functions.md#esql-st_geohex_to_string)
-  * [preview] [`ST_GEOHEX_TO_LONG`](../../functions-operators/spatial-functions.md#esql-st_geohex_to_long)
-* [preview] [`ST_GEOHASH`](../../functions-operators/spatial-functions.md#esql-st_geohash)
-  * [preview] [`ST_GEOHASH_TO_STRING`](../../functions-operators/spatial-functions.md#esql-st_geohash_to_string)
-  * [preview] [`ST_GEOHASH_TO_LONG`](../../functions-operators/spatial-functions.md#esql-st_geohash_to_long)

docs/reference/query-languages/esql/_snippets/lists/spatial-functions.md

@@ -48,29 +48,3 @@ mapped_pages:
 :::{include} ../_snippets/functions/layout/st_ymin.md
 :::
 
-:::{include} ../_snippets/functions/layout/st_geotile.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geotile_to_string.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geotile_to_long.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geohex.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geohex_to_string.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geohex_to_long.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geohash.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geohash_to_string.md
-:::
-
-:::{include} ../_snippets/functions/layout/st_geohash_to_long.md
-:::