Make close() in interface Watch<T> public

Closes #31526

src/compiler/watch.ts

@@ -603,7 +603,6 @@ namespace ts {
         /*@internal*/
         getCurrentProgram(): T;
         /** Closes the watch */
-        /*@internal*/
         close(): void;
     }
 

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -4548,6 +4548,8 @@ declare namespace ts {
     interface Watch<T> {
         /** Synchronize with host and get updated program */
         getProgram(): T;
+        /** Closes the watch */
+        close(): void;
     }
     /**
      * Creates the watch what generates program using the config file

tests/baselines/reference/api/typescript.d.ts

@@ -4548,6 +4548,8 @@ declare namespace ts {
     interface Watch<T> {
         /** Synchronize with host and get updated program */
         getProgram(): T;
+        /** Closes the watch */
+        close(): void;
     }
     /**
      * Creates the watch what generates program using the config file