fix: remove stray debug print in RangeQueryParameter constructor (#17973)

`RangeQueryParameter.__init__` in `google-cloud-bigquery` has a leftover
debug `print()`:

```python
self.range_element_type = self._parse_range_element_type(range_element_type)
print(self.range_element_type.type_._type)   # <- this
self.start = start
```

It fires on every construction, so anyone building a RANGE query
parameter gets the element type dumped to stdout. Easy to reproduce:

```python
>>> from google.cloud.bigquery.query import RangeQueryParameter
>>> RangeQueryParameter(range_element_type="DATE", start="2016-08-11")
DATE
```

This removes the line and adds a small regression test that asserts
nothing is printed during construction. Verified the test fails on the
current code (`Expected 'print' to not have been called. Called 1 times.
Calls: [call('DATE')]`) and passes after the removal. All existing
RangeQueryParameter tests still pass, black is clean.

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Author: fixedbydev

packages/google-cloud-bigquery/google/cloud/bigquery/query.py

@@ -1020,7 +1020,6 @@ def __init__(
     ):
         self.name = name
         self.range_element_type = self._parse_range_element_type(range_element_type)
-        print(self.range_element_type.type_._type)
         self.start = start
         self.end = end
 

packages/google-cloud-bigquery/tests/unit/test_query.py

@@ -778,6 +778,13 @@ def test_ctor(self):
         self.assertEqual(param.start, "2016-08-11")
         self.assertIs(param.end, None)
 
+    def test_ctor_does_not_print_to_stdout(self):
+        # Regression test for a stray debug print() in __init__ that wrote the
+        # range element type to stdout on every construction.
+        with mock.patch("builtins.print") as mock_print:
+            self._make_one(range_element_type="DATE", start="2016-08-11")
+        mock_print.assert_not_called()
+
     def test_ctor_w_datetime_query_parameter_type_str(self):
         from google.cloud.bigquery.query import RangeQueryParameterType