Modify grammar

Author: ioanatia

x-pack/plugin/esql/src/main/antlr/EsqlBaseLexer.tokens

@@ -57,11 +57,11 @@ processingCommand
     | joinCommand
     | changePointCommand
     | completionCommand
+    | forkCommand
     // in development
     | {this.isDevVersion()}? inlinestatsCommand
     | {this.isDevVersion()}? lookupCommand
     | {this.isDevVersion()}? insistCommand
-    | {this.isDevVersion()}? forkCommand
     | {this.isDevVersion()}? rerankCommand
     | {this.isDevVersion()}? rrfCommand
     | {this.isDevVersion()}? sampleCommand
@@ -278,7 +278,7 @@ insistCommand
     ;
 
 forkCommand
-    : DEV_FORK forkSubQueries
+    : FORK forkSubQueries
     ;
 
 forkSubQueries

x-pack/plugin/esql/src/main/antlr/EsqlBaseParser.g4

@@ -9,7 +9,7 @@ lexer grammar Fork;
 //
 // Fork
 //
-DEV_FORK :        {this.isDevVersion()}? 'fork'          -> pushMode(FORK_MODE);
+FORK : 'fork' -> pushMode(FORK_MODE);
 
 mode FORK_MODE;
 // commands needs to break out of their mode and the default mode when they encounter RP