[DOCS][ESQL] GA search functions for 9.1 (elastic#129786)

* [DOCS][ESQL] Flip preview booleans, to GA search functions

* render docs, tweak some applies_to metadata in docs gen code

- **rendered docs (md):**
  - kql: removed serverless preview, added ga 9.1.0
  - match: removed serverless preview, added ga 9.1.0
  - match_phrase: changed from preview 9.1.0 to unavailable 9.0 + ga 9.1.0
  - qstr: removed serverless preview, added ga 9.1.0
  - search functions list: removed bullet point before term function

- **docs generation code (java):**
  - match_phrase: updated function info annotations to unavailable 9.0 + ga 9.1.0
  - query_string: uncommented ga 9.1.0 annotation

Author: leemthompo

docs/reference/query-languages/esql/_snippets/functions/layout/kql.md

@@ -1,5 +1,5 @@
-* [preview] [`KQL`](../../functions-operators/search-functions.md#esql-kql)
-* [preview] [`MATCH`](../../functions-operators/search-functions.md#esql-match)
-* [preview] [`MATCH_PHRASE`](../../functions-operators/search-functions.md#esql-match_phrase)
-* [preview] [`QSTR`](../../functions-operators/search-functions.md#esql-qstr)
+* [`KQL`](../../functions-operators/search-functions.md#esql-kql)
+* [`MATCH`](../../functions-operators/search-functions.md#esql-match)
+* [`MATCH_PHRASE`](../../functions-operators/search-functions.md#esql-match_phrase)
+* [`QSTR`](../../functions-operators/search-functions.md#esql-qstr)
 % * [preview] [`TERM`](../../functions-operators/search-functions.md#esql-term)

docs/reference/query-languages/esql/_snippets/functions/layout/match.md

@@ -1,7 +1,6 @@
 ### Match operator (`:`) [esql-match-operator]
 ```{applies_to}
-stack: preview 9.0.0
-serverless: preview
+stack: preview 9.0, ga 9.1
 ```
 
 The only search operator is match (`:`).
@@ -13,12 +12,6 @@ The only search operator is match (`:`).
 :class: text-center
 :::
 
-
-::::{warning}
-Do not use on production environments. This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
-::::
-
-
 The match operator performs a [match query](/reference/query-languages/query-dsl/query-dsl-match-query.md) on the specified field. Returns true if the provided query matches the row.
 
 The match operator is equivalent to the [match function](../../../functions-operators/search-functions.md#esql-match).