feat: add new group members endpoint with filtering and pagination (#23067)

Partially addresses #21813 (still need to make changes to the "add user"
button to be complete)

Since there are a lot of user tests already, I moved them into
`coderdtest` to be shared.

coderd/coderdtest/coderdtest.go

@@ -900,9 +900,10 @@ func createAnotherUserRetry(t testing.TB, client *codersdk.Client, organizationI
 	require.NoError(t, err)
 
 	var sessionToken string
-	if req.UserLoginType == codersdk.LoginTypeNone {
-		// Cannot log in with a disabled login user. So make it an api key from
-		// the client making this user.
+	switch req.UserLoginType {
+	case codersdk.LoginTypeNone, codersdk.LoginTypeGithub, codersdk.LoginTypeOIDC:
+		// Cannot log in with a non-password user. So make it an api key from the
+		// client making this user.
 		token, err := client.CreateToken(context.Background(), user.ID.String(), codersdk.CreateTokenRequest{
 			Lifetime:  time.Hour * 24,
 			Scope:     codersdk.APIKeyScopeAll,
@@ -910,7 +911,7 @@ func createAnotherUserRetry(t testing.TB, client *codersdk.Client, organizationI
 		})
 		require.NoError(t, err)
 		sessionToken = token.Key
-	} else {
+	default:
 		login, err := client.LoginWithPassword(context.Background(), codersdk.LoginWithPasswordRequest{
 			Email:    req.Email,
 			Password: req.Password,