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/constants.ts

@@ -95,3 +95,10 @@ export const MAKE_TOAST_MESSAGES = {
   ERROR_STARTING_PRINT: 'Error while starting print',
   SUCCESS: 'Started print successfully',
 }
+
+/** The URL for the KCL samples manifest files */
+export const KCL_SAMPLES_MANIFEST_URLS = {
+  remote:
+    'https://raw.githubusercontent.com/KittyCAD/kcl-samples/main/manifst.json',
+  localFallback: '/kcl-samples-manifest-fallback.json',
+} as const