Add ability to open KCL samples in-app (#3912)

* Add a shell script to get the list of KCL samples into the app

* Add support for overwriting current file with sample

* Move these KCL commands down into FileMachineProvider

* Add support for creating a new file on desktop

* Make it so these files aren't set to "renaming mode" right away

* Add support for initializing default values that are functions

* Add E2E tests

* Add a code menu item to load a sample

* Fix tsc issues

* Remove `yarn fetch:samples` from `yarn postinstall`

* Remove change to arg initialization logic, I was holding it wrong

* Switch to use new manifest file from kcl-samples repo

* Update tests now that we use proper sample titles

* Remove double-load from units menu test

* @jtran feedback

* Don't encode `https://` that's silly

* fmt

* Update e2e/playwright/testing-samples-loading.spec.ts

Co-authored-by: Kurt Hutten <k.hutten@protonmail.ch>

* Test feedback

* Add a test step to actually check the file contents were written to (@Irev-Dev feedback)

---------

Co-authored-by: Kurt Hutten <k.hutten@protonmail.ch>

src/lib/getKclSamplesManifest.ts

@@ -0,0 +1,31 @@
+import { KCL_SAMPLES_MANIFEST_URLS } from './constants'
+import { isDesktop } from './isDesktop'
+
+export type KclSamplesManifestItem = {
+  file: string
+  title: string
+  description: string
+}
+
+export async function getKclSamplesManifest() {
+  let response = await fetch(KCL_SAMPLES_MANIFEST_URLS.remote)
+  if (!response.ok) {
+    console.warn(
+      'Failed to fetch latest remote KCL samples manifest, falling back to local:',
+      response.statusText
+    )
+    response = await fetch(
+      (isDesktop() ? '.' : '') + KCL_SAMPLES_MANIFEST_URLS.localFallback
+    )
+    if (!response.ok) {
+      console.error(
+        'Failed to fetch fallback KCL samples manifest:',
+        response.statusText
+      )
+      return []
+    }
+  }
+  return response.json().then((manifest) => {
+    return manifest as KclSamplesManifestItem[]
+  })
+}