Fix Hive metastore partition sensor initialization

[henry3260]

Why

MetastorePartitionSensor documents mysql_conn_id as the connection argument and is intended to generate the Hive metastore partition query internally. After inheriting from SqlSensor, the documented constructor path still required callers to pass the parent conn_id and sql arguments manually, so normal usage did not match the public API.

The sensor also interpolated templated table, schema, and partition values directly into the SQL string. Passing those values through SQL parameters keeps the query construction aligned with SqlSensor behavior.

What

• Updated providers/apache/hive/src/airflow/providers/apache/hive/sensors/metastore_partition.py so MetastorePartitionSensor passes mysql_conn_id to SqlSensor as conn_id and owns the metastore partition SQL.
• Changed poke() to split schema.table input at runtime and pass table, schema, and partition_name through SqlSensor.parameters.
• Expanded SqlSensor template fields while preserving partition_name, table, and schema templating.
• Updated providers/apache/hive/tests/unit/apache/hive/sensors/test_metastore_partition.py to cover the documented constructor, schema/table splitting, and parameterized SQL call.
• Updated the existing Hive metastore sensor test setup to use mysql_conn_id.

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