fix(db-postgres): sort by distance when the near operator is used (#12185)

Fixes https://github.com/payloadcms/payload/issues/12090, in MongoDB the
documents are sorted by distance automatically whenever the `near`
operation is used, which we have in the docs:
> When querying using the near operator, the returned documents will be
sorted by nearest first.
This fixes this incosistensty between Postgres and MongoDB.

⚠️ This change potentially can cause to produce different results, if
you used the `near` operator without `sort: 'pointFieldName'`.

test/collections-rest/int.spec.ts

@@ -1218,7 +1218,6 @@ describe('collections-rest', () => {
             .GET(`/${pointSlug}`, {
               query: {
                 limit: 5,
-                sort: 'point',
                 where: {
                   point: {
                     // querying large enough range to include all docs