fix(db-postgres): prevent indexes from changing name on HMR (#10154)

As we didn't reset our `adapter.indexes` state, on every HMR reload we
incremented every single index name with the `buildIndexName`:

https://github.com/payloadcms/payload/blob/466f109152bc6bf9a67e7d7bafd38c7d57a881de/packages/drizzle/src/utilities/buildIndexName.ts#L3-L24

I found this while debugging our internal SQL schema:

Before reload:

```ts
 "payload_preferences": {
    "name": "payload_preferences",
    "columns": {
      "id": {
        "name": "id",
        "type": "serial",
        "primaryKey": true
      },
      "key": {
        "name": "key",
        "type": "varchar"
      },
      "value": {
        "name": "value",
        "type": "jsonb"
      },
      "updatedAt": {
        "name": "updated_at",
        "type": "timestamp",
        "defaultNow": true,
        "mode": "string",
        "notNull": true,
        "precision": 3,
        "withTimezone": true
      },
      "createdAt": {
        "name": "created_at",
        "type": "timestamp",
        "defaultNow": true,
        "mode": "string",
        "notNull": true,
        "precision": 3,
        "withTimezone": true
      }
    },
    "foreignKeys": {},
    "indexes": {
      "payload_preferences_key_idx": {
        "name": "payload_preferences_key_idx",
        "on": "key"
      },
      "payload_preferences_updated_at_idx": {
        "name": "payload_preferences_updated_at_idx",
        "on": "updatedAt"
      },
      "payload_preferences_created_at_idx": {
        "name": "payload_preferences_created_at_idx",
        "on": "createdAt"
      }
    }
  },
```

After:
```ts

"payload_preferences": {
    "name": "payload_preferences",
    "columns": {
      "id": {
        "name": "id",
        "type": "serial",
        "primaryKey": true
      },
      "key": {
        "name": "key",
        "type": "varchar"
      },
      "value": {
        "name": "value",
        "type": "jsonb"
      },
      "updatedAt": {
        "name": "updated_at",
        "type": "timestamp",
        "defaultNow": true,
        "mode": "string",
        "notNull": true,
        "precision": 3,
        "withTimezone": true
      },
      "createdAt": {
        "name": "created_at",
        "type": "timestamp",
        "defaultNow": true,
        "mode": "string",
        "notNull": true,
        "precision": 3,
        "withTimezone": true
      }
    },
    "foreignKeys": {},
    "indexes": {
      "payload_preferences_key_1_idx": {
        "name": "payload_preferences_key_1_idx",
        "on": "key"
      },
      "payload_preferences_updated_at_1_idx": {
        "name": "payload_preferences_updated_at_1_idx",
        "on": "updatedAt"
      },
      "payload_preferences_created_at_1_idx": {
        "name": "payload_preferences_created_at_1_idx",
        "on": "createdAt"
      }
    }
  },
```
Which isn't really great for dev performance and can potentially cause
errors