Fix: Reimplement part of the integrity check for workspaces (#4122)

**Summary**

Fixes #3863. The integrity file doesn't currently support workspaces,
which leads to #3863 (removing a workspace node_modules folder and
running yarn doesn't do anything, because Yarn incorrectly assumes
that everything is already done).

This PR rewrites a good chunk of the integrity logic to support and
fix this behavior.

**Test plan**

New and already existing automated tests.

src/cli/commands/install.js

@@ -352,7 +352,7 @@ export class Install {
     if (!patterns.length && !match.integrityFileMissing) {
       this.reporter.success(this.reporter.lang('nothingToInstall'));
       await this.createEmptyManifestFolders();
-      await this.saveLockfileAndIntegrity(patterns);
+      await this.saveLockfileAndIntegrity(patterns, workspaceLayout);
       return true;
     }
 
@@ -675,7 +675,7 @@ export class Install {
       patterns,
       lockfileBasedOnResolver,
       this.flags,
-      this.resolver.usedRegistries,
+      workspaceLayout,
       this.scripts.getArtifacts(),
     );
 

src/constants.js

@@ -59,6 +59,8 @@ export const CONFIG_DIRECTORY = getDirectory('config');
 export const LINK_REGISTRY_DIRECTORY = path.join(CONFIG_DIRECTORY, 'link');
 export const GLOBAL_MODULE_DIRECTORY = path.join(CONFIG_DIRECTORY, 'global');
 
+export const NODE_MODULES_FOLDER = 'node_modules';
+
 export const POSIX_GLOBAL_PREFIX = '/usr/local';
 export const FALLBACK_GLOBAL_PREFIX = path.join(userHome, '.yarn');