build: fix tsconfig monorepo setup (#10028)

Should fix messed up import suggestions and simplifies all tsconfigs
through inheritance.

One main issue was that packages were inheriting `baseURL: "."` from the
root tsconfig. This caused incorrect import suggestions that start with
"packages/...".

This PR ensures that packages do not inherit this baseURL: "." property,
while ensuring the root, non-inherited tsconfig still keeps it to get
tests to work (the importMap needs it)

scripts/reset-tsconfig.js

@@ -11,15 +11,20 @@ import { parse, stringify } from 'comment-json'
 import path from 'path'
 import fs from 'fs/promises'
 import { fileURLToPath } from 'url'
+import { existsSync } from 'fs'
 
 const filename = fileURLToPath(import.meta.url)
 const dirname = path.dirname(filename)
 
-const tsConfigPath = path.resolve(dirname, '../tsconfig.json')
+const tsConfigBasePath = path.resolve(dirname, '../tsconfig.base.json')
+const tsConfigPath = existsSync(tsConfigBasePath)
+  ? tsConfigBasePath
+  : path.resolve(dirname, '../tsconfig.json')
+
+
 const tsConfigContent = await fs.readFile(tsConfigPath, 'utf8')
 const tsConfig = parse(tsConfigContent)
 
-// @ts-expect-error
 tsConfig.compilerOptions.paths['@payload-config'] = ['./test/_community/config.ts']
 const output = stringify(tsConfig, null, 2) + `\n`
 await fs.writeFile(tsConfigPath, output)