Remove bqsql magic registration and references

Removes the `%%bqsql` magic alias, including its registration in `__init__.py`,
references in documentation (README.rst, magics.rst, docstrings), and unit tests.
This magic was an alias for `%%bigquery`.

Co-authored-by: tswast <247555+tswast@users.noreply.github.com>

Author: google-labs-jules[bot]

README.rst

@@ -101,15 +101,3 @@ Perform a query
     GROUP BY name
     ORDER BY count DESC
     LIMIT 3
-
-Since BigQuery supports Python via BigQuery DataFrames, `%%bqsql` is offered as
-an alias to clarify the language of these cells.
-
-.. code:: python
-
-    %%bqsql
-    SELECT name, SUM(number) as count
-    FROM 'bigquery-public-data.usa_names.usa_1910_current'
-    GROUP BY name
-    ORDER BY count DESC
-    LIMIT 3

bigquery_magics/__init__.py

@@ -30,7 +30,6 @@ def load_ipython_extension(ipython):
     ipython.register_magic_function(
         _cell_magic, magic_kind="cell", magic_name="bigquery"
     )
-    ipython.register_magic_function(_cell_magic, magic_kind="cell", magic_name="bqsql")
 
     global is_registered
     is_registered = True

bigquery_magics/bigquery.py

@@ -14,13 +14,13 @@
 
 """IPython Magics
 
-.. function:: ``%%bigquery`` or ``%%bqsql``
+.. function:: ``%%bigquery``
 
     IPython cell magic to run a query and display the result as a DataFrame
 
     .. code-block:: python
 
-        %%bqsql [<destination_var>] [--project <project>] [--use_legacy_sql]
+        %%bigquery [<destination_var>] [--project <project>] [--use_legacy_sql]
                    [--verbose] [--params <params>]
         <query>
 

docs/magics.rst

@@ -8,7 +8,7 @@ in a Jupyter notebook cell.
 
     %load_ext bigquery_magics
 
-This makes the ``%%bigquery`` and ``%%bqsql`` magics available.
+This makes the ``%%bigquery`` magic available.
 
 Code Samples
 ------------

tests/unit/bigquery/test_bigquery.py

@@ -341,7 +341,6 @@ def test__create_dataset_if_necessary_not_exist():
     ("magic_name",),
     (
         ("bigquery",),
-        ("bqsql",),
     ),
 )
 def test_extension_load(magic_name):