fix(server-core): Fix getCompilersInstances to not return compiler promise

Author: KSDaemon

packages/cubejs-server-core/src/core/CompilerApi.js

@@ -100,10 +100,6 @@ export class CompilerApi {
    * because it could fail and no compilers will be returned.
    */
   getCompilersInstances() {
-    if (this.compilers) {
-      return this.compilers;
-    }
-
     return prepareCompiler(this.repository, {
       allowNodeRequire: this.allowNodeRequire,
       compileContext: this.compileContext,