fix(scripts): cleanup guides gen before generation (#4455)

Author: shortcuts

scripts/common.ts

@@ -10,7 +10,7 @@ import clientsConfig from '../config/clients.config.json' with { type: 'json' };
 import releaseConfig from '../config/release.config.json' with { type: 'json' };
 
 import { Cache } from './cache.ts';
-import { getDockerImage } from './config.ts';
+import { getDockerImage, getTestOutputFolder } from './config.ts';
 import { generateOpenapitools } from './pre-gen/index.ts';
 import { getGitAuthor } from './release/common.ts';
 import { buildSpecs } from './specs/index.ts';
@@ -293,6 +293,12 @@ export async function setupAndGen(
   await buildCustomGenerators();
 
   for (const gen of generators) {
+    if (mode === 'guides') {
+      await run(`rm -rf ${path.join('docs', mode, gen.language, getTestOutputFolder(gen.language))}`, {
+        language: gen.language,
+      });
+    }
+
     const spinner = createSpinner(`generating ${mode} for ${gen.key}`);
     await fn(gen);
     spinner.succeed();