Strip double quotes from index names

Postgres stores index names with uppercase characters in the `pg_index`
catalog using the quoted version of the name. For example:

```
"idx_USERS_name"
```

whereas a lowercase index name would be stored as:

```
idx_users_name
```

This is different to how other object types are stored in their
respective catalogs. For example, table names are stored in the
`pg_class` catalog without quotes, regardless of whether they contain
uppercase characters.

pkg/state/state.go

@@ -174,7 +174,7 @@ BEGIN
 				  )), '{}'::json)
 				  FROM (
 				    SELECT 
-				      reverse(split_part(reverse(pi.indexrelid::regclass::text), '.', 1)) as name,
+				      replace(reverse(split_part(reverse(pi.indexrelid::regclass::text), '.', 1)), '"', '') as name,
 				      pi.indisunique,
 				      array_agg(a.attname) AS columns
 				    FROM pg_index pi