Make isDynamicFileName available publicly (#38269)

* Make isDynamicFileName available publicly

This commit fixes #37987

* Acknowledge Public APIs

src/server/scriptInfo.ts

@@ -270,7 +270,6 @@ namespace ts.server {
         }
     }
 
-    /*@internal*/
     export function isDynamicFileName(fileName: NormalizedPath) {
         return fileName[0] === "^" ||
             ((stringContains(fileName, "walkThroughSnippet:/") || stringContains(fileName, "untitled:/")) &&

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

@@ -8784,6 +8784,7 @@ declare namespace ts.server {
         svc: number;
         text: number;
     }
+    function isDynamicFileName(fileName: NormalizedPath): boolean;
     class ScriptInfo {
         private readonly host;
         readonly fileName: NormalizedPath;