chore: fix various e2e test setup issues (#12670)

I noticed a few issues when running e2e tests that will be resolved by
this PR:

- Most important: for some test suites (fields, fields-relationship,
versions, queues, lexical), the database was cleared and seeded
**twice** in between each test run. This is because the onInit function
was running the clear and seed script, when it should only have been
running the seed script. Clearing the database / the snapshot workflow
is being done by the reInit endpoint, which then calls onInit to seed
the actual data.
- The slowest part of `clearAndSeedEverything` is recreating indexes on
mongodb. This PR slightly improves performance here by:
- Skipping this process for the built-in `['payload-migrations',
'payload-preferences', 'payload-locked-documents']` collections
- Previously we were calling both `createIndexes` and `ensureIndexes`.
This was unnecessary - `ensureIndexes` is a deprecated alias of
`createIndexes`. This PR changes it to only call `createIndexes`
- Makes the reinit endpoint accept GET requests instead of POST requests
- this makes it easier to debug right in the browser
- Some typescript fixes
- Adds a `dev:memorydb` script to the package.json. For some reason,
`dev` is super unreliable on mongodb locally when running e2e tests - it
frequently fails during index creation. Using the memorydb fixes this
issue, with the bonus of more closely resembling the CI environment
- Previously, you were unable to run test suites using turbopack +
postgres. This fixes it, by explicitly installing `pg` as devDependency
in our monorepo
- Fixes jest open handles warning

test/fields/baseConfig.ts

@@ -38,7 +38,7 @@ import UploadsMultiPoly from './collections/UploadMultiPoly/index.js'
 import UploadsPoly from './collections/UploadPoly/index.js'
 import UploadRestricted from './collections/UploadRestricted/index.js'
 import Uploads3 from './collections/Uploads3/index.js'
-import { clearAndSeedEverything } from './seed.js'
+import { seed } from './seed.js'
 
 export const collectionSlugs: CollectionConfig[] = [
   {
@@ -157,7 +157,7 @@ export const baseConfig: Partial<Config> = {
   },
   onInit: async (payload) => {
     if (process.env.SEED_IN_CONFIG_ONINIT !== 'false') {
-      await clearAndSeedEverything(payload)
+      await seed(payload)
     }
   },
   typescript: {