docs: correct model deprecation warning for gemini text generator (#1562)

* docs: correct model deprecation warning for gemini text generator

* add remove model warning

* just remove unnecessary warning

Author: shuoweil

bigframes/ml/llm.py

@@ -21,7 +21,6 @@
 
 import bigframes_vendored.constants as constants
 from google.cloud import bigquery
-import typing_extensions
 
 from bigframes import dtypes, exceptions
 import bigframes.bigquery as bbq
@@ -403,10 +402,6 @@ def to_gbq(
         return new_model.session.read_gbq_model(model_name)
 
 
-@typing_extensions.deprecated(
-    "gemini-1.5-X are going to be deprecated. Use gemini-2.0-X (https://cloud.google.com/python/docs/reference/bigframes/latest/bigframes.ml.llm.GeminiTextGenerator) instead. ",
-    category=exceptions.ApiDeprecationWarning,
-)
 @log_adapter.class_logger
 class GeminiTextGenerator(base.RetriableRemotePredictor):
     """Gemini text generator LLM model.

tests/system/small/ml/test_llm.py

@@ -807,20 +807,6 @@ def test_llm_gemini_pro_score_params(llm_fine_tune_df_default_index, model_name)
     )
 
 
-@pytest.mark.parametrize(
-    "model_name",
-    (
-        "gemini-1.5-pro-001",
-        "gemini-1.5-pro-002",
-        "gemini-1.5-flash-001",
-        "gemini-1.5-flash-002",
-    ),
-)
-def test_gemini_text_generator_deprecated(model_name):
-    with pytest.warns(exceptions.ApiDeprecationWarning):
-        llm.GeminiTextGenerator(model_name=model_name)
-
-
 @pytest.mark.parametrize(
     "model_name",
     (