vitest: Fix workspace config wrt client/web/ (#58397)

It appears that the workspace configuration is somehow broken because it
doesn't include any tests defined in `client/web/src/`. This can be
tested by filtering for a test inside this subtree, for example

    pnpm exec vitest RepoRevisionSidebar

vitest will error saying it didn't find any tests. The list of projects
it prints also doesn't include `web`.

I don't know what exactly it is that makes it exclude `client/web/` but
with the simpler version in this PR `client/web/` will be included.

I removed `client/web/dev/` from the list because it will be included by
`client/web/` too and seems to "just work" even though it has it's own
configuration file.

Author: fkling

vitest.workspace.ts

@@ -1,18 +1,16 @@
-import { readFileSync, existsSync } from 'fs'
+import { readFileSync } from 'fs'
 import path from 'path'
 
-import glob from 'glob'
 import { load } from 'js-yaml'
-import { defineWorkspace } from 'vitest/config'
 
 interface PnpmWorkspaceFile {
     packages: string[]
 }
-const workspaceFile = load(readFileSync(path.join(__dirname, 'pnpm-workspace.yaml'), 'utf8')) as PnpmWorkspaceFile
-workspaceFile.packages.push('client/web/dev') // is a tsconfig project but not a pnpm workspace package
-const projectRoots = workspaceFile.packages
-    .flatMap(p => glob.sync(`${p}/`, { cwd: __dirname }))
-    .map(p => p.replace(/\/$/, ''))
-    .filter(dir => existsSync(path.join(dir, 'vitest.config.ts')))
 
-export default defineWorkspace(projectRoots)
+function fromPnpmWorkspaceFile(filePath: string): string[] {
+    return (load(readFileSync(filePath, 'utf8')) as PnpmWorkspaceFile).packages.map(p => `${p}/vitest.config.ts`, {
+        cwd: __dirname,
+    })
+}
+
+export default fromPnpmWorkspaceFile(path.join(__dirname, 'pnpm-workspace.yaml'))