fix: permissions (#698)

* get my zitadel permissions from memberships (not grants)

* change SearchMyProjectOrgs to user user_membership

migrations/cockroach/V1.11__usermembership.sql

@@ -0,0 +1,18 @@
+CREATE TABLE auth.user_memberships (
+    user_id TEXT,
+    member_type SMALLINT,
+    aggregate_id TEXT,
+    object_id TEXT,
+
+    roles TEXT ARRAY,
+    display_name TEXT,
+    resource_owner TEXT,
+    resource_owner_name TEXT,
+    creation_date TIMESTAMPTZ,
+    change_date TIMESTAMPTZ,
+    sequence BIGINT,
+
+    PRIMARY KEY (user_id, member_type, aggregate_id, object_id)
+);
+
+ALTER TABLE management.user_memberships ADD COLUMN resource_owner_name TEXT;