fix: Update grammars (#75)

This PR updates the ES|QL grammars (lexer and parser) and PromQL
grammars to match the latest version in Elasticsearch.

Co-authored-by: Grammar Sync Bot <elasticmachine@users.noreply.github.com>

Author: elastic-vault-github-plugin-prod[bot]

src/parser/antlr/esql_lexer.interp

@@ -75,6 +75,7 @@ processingCommand
     | metricsInfoCommand
     | registeredDomainCommand
     | tsInfoCommand
+    | userAgentCommand
     | mmrCommand
     // in development
     | {this.isDevVersion()}? lookupCommand
@@ -119,7 +120,7 @@ indexPatternAndMetadataFields
 
 indexPatternOrSubquery
     : indexPattern
-    | {this.isDevVersion()}? subquery
+    | subquery
     ;
 
 subquery
@@ -395,6 +396,10 @@ registeredDomainCommand
     : REGISTERED_DOMAIN qualifiedName ASSIGN primaryExpression
     ;
 
+userAgentCommand
+    : USER_AGENT qualifiedName ASSIGN primaryExpression commandNamedParameters
+    ;
+
 setCommand
     : SET setField SEMICOLON
     ;