Do not migrate READ_METADATA to BROWSE on tables and schemas (#2022)

## Changes
UC only support BROWSE privilege on catalog object. Translate legacy
hive_metastore privilege READ_METADATA on tables and databases to BROWSE
privilege on UC tables and schemas will fail and cause error messages in
the migrate tables workflow logs, such error messages will confuse the
users.

Author: qziyuan

src/databricks/labs/ucx/hive_metastore/grants.py

@@ -167,19 +167,16 @@ def uc_grant_sql(self, object_type: str | None = None, object_key: str | None =
             ("FUNCTION", "SELECT"): self._uc_action("EXECUTE"),
             ("TABLE", "SELECT"): self._uc_action("SELECT"),
             ("TABLE", "MODIFY"): self._uc_action("MODIFY"),
-            ("TABLE", "READ_METADATA"): self._uc_action("BROWSE"),
             ("TABLE", "ALL PRIVILEGES"): self._uc_action("ALL PRIVILEGES"),
             ("TABLE", "OWN"): self._set_owner_sql,
             ("VIEW", "SELECT"): self._uc_action("SELECT"),
-            ("VIEW", "READ_METADATA"): self._uc_action("BROWSE"),
             ("VIEW", "OWN"): self._set_owner_sql,
             ("DATABASE", "USAGE"): self._uc_action("USE SCHEMA"),
             ("DATABASE", "CREATE"): self._uc_action("CREATE TABLE"),
             ("DATABASE", "CREATE_NAMED_FUNCTION"): self._uc_action("CREATE FUNCTION"),
             ("DATABASE", "SELECT"): self._uc_action("SELECT"),
             ("DATABASE", "MODIFY"): self._uc_action("MODIFY"),
             ("DATABASE", "OWN"): self._set_owner_sql,
-            ("DATABASE", "READ_METADATA"): self._uc_action("BROWSE"),
             ("CATALOG", "OWN"): self._set_owner_sql,
             ("CATALOG", "USAGE"): self._uc_action("USE CATALOG"),
         }

tests/unit/hive_metastore/test_grants.py

@@ -117,7 +117,7 @@ def test_hive_deny_sql():
     [
         (
             Grant("user", "READ_METADATA", catalog="hive_metastore", database="mydb", table="mytable"),
-            "GRANT BROWSE ON TABLE hive_metastore.mydb.mytable TO `user`",
+            None,
         ),
         (
             Grant("me", "OWN", catalog="hive_metastore", database="mydb", table="mytable"),