[postgres] dont use urlquote_plus (#7723)

### Summary & Motivation

`quote_plus` replaces spaces with plus, which causes users passwords to not work.

https://docs.python.org/3.8/library/urllib.parse.html#urlparse.parse_qs

blame rev is https://dagster.phacility.com/D1830, not sure why i used `quote_plus` originally.

resolves #5452


### How I Tested These Changes

updated test to include spaces

python_modules/libraries/dagster-postgres/dagster_postgres/utils.py

@@ -1,9 +1,7 @@
 import logging
 import time
 from contextlib import contextmanager
-from urllib.parse import quote
-from urllib.parse import quote_plus as urlquote
-from urllib.parse import urlencode
+from urllib.parse import quote, urlencode
 
 import psycopg2
 import psycopg2.errorcodes
@@ -60,7 +58,7 @@ def pg_url_from_config(config_value):
 
 
 def get_conn_string(username, password, hostname, db_name, port="5432", params=None):
-    uri = f"postgresql://{urlquote(username)}:{urlquote(password)}@{hostname}:{port}/{db_name}"
+    uri = f"postgresql://{quote(username)}:{quote(password)}@{hostname}:{port}/{db_name}"
 
     if params:
         query_string = f"{urlencode(params, quote_via=quote)}"

python_modules/libraries/dagster-postgres/dagster_postgres_tests/test_instance.py

@@ -227,7 +227,7 @@ def test_specify_pg_params(hostname):
 
 def test_conn_str():
     username = "has@init"
-    password = "full:of:junk!@?"
+    password = ":full: of junk!@?"
     db_name = "dagster"
     hostname = "database-city.com"
 
@@ -239,7 +239,7 @@ def test_conn_str():
     )
     assert (
         conn_str
-        == r"postgresql://has%40init:full%3Aof%3Ajunk%21%40%3F@database-city.com:5432/dagster"
+        == r"postgresql://has%40init:%3Afull%3A%20of%20junk%21%40%3F@database-city.com:5432/dagster"
     )
     parsed = urlparse(conn_str)
     assert unquote(parsed.username) == username