Move stubs from ./stubs to ./shared/Stubs

Gathers all shared test code in single place.

tests/unit/shared/Stubs/PipelineCompilerStub.ts

@@ -0,0 +1,10 @@
+import { IPipelineCompiler } from '@/application/Parser/Script/Compiler/Expressions/Pipes/IPipelineCompiler';
+
+export class PipelineCompilerStub implements IPipelineCompiler {
+  public compileHistory: Array<{ value: string, pipeline: string }> = [];
+
+  public compile(value: string, pipeline: string): string {
+    this.compileHistory.push({ value, pipeline });
+    return `value: ${value}"\n${pipeline}: ${pipeline}`;
+  }
+}