PySpark spark.streams should not recreate new StreamingQueryManager

In Scala, there is only one streaming query manager for one spark session:

```

scala> spark.streams

val res0: org.apache.spark.sql.streaming.StreamingQueryManager = org.apache.spark.sql.streaming.StreamingQueryManager@46bb8cba

scala> spark.streams

val res1: org.apache.spark.sql.streaming.StreamingQueryManager = org.apache.spark.sql.streaming.StreamingQueryManager@46bb8cba

scala> spark.streams

val res2: org.apache.spark.sql.streaming.StreamingQueryManager = org.apache.spark.sql.streaming.StreamingQueryManager@46bb8cba

scala> spark.streams

val res3: org.apache.spark.sql.streaming.StreamingQueryManager = org.apache.spark.sql.streaming.StreamingQueryManager@46bb8cba

```

In Python, this is currently false:

```

>>> spark.streams

<pyspark.sql.connect.streaming.query.StreamingQueryManager object at 0x1011f7c10>

>>> spark.streams

<pyspark.sql.connect.streaming.query.StreamingQueryManager object at 0x1011f71f0>

>>> spark.streams

<pyspark.sql.connect.streaming.query.StreamingQueryManager object at 0x1011f7be0>

>>> spark.streams

<pyspark.sql.connect.streaming.query.StreamingQueryManager object at 0x1011f7c40>

```

Python should align scala behavior.