Remove AIRFLOW_V_2_7_PLUS constant (apache#42627)

Author: vincbeck

contributing-docs/testing/unit_tests.rst

@@ -1184,10 +1184,10 @@ are not part of the public API. We deal with it in one of the following ways:
 
 .. code-block:: python
 
-  from tests.test_utils.compat import AIRFLOW_V_2_7_PLUS
+  from tests.test_utils.compat import AIRFLOW_V_2_8_PLUS
 
 
-  @pytest.mark.skipif(not AIRFLOW_V_2_7_PLUS, reason="The tests should be skipped for Airflow < 2.7")
+  @pytest.mark.skipif(not AIRFLOW_V_2_8_PLUS, reason="The tests should be skipped for Airflow < 2.8")
   def some_test_that_only_works_for_airflow_2_7_plus():
       pass
 

tests/test_utils/compat.py

@@ -42,7 +42,6 @@
 from airflow import __version__ as airflow_version
 
 AIRFLOW_VERSION = Version(airflow_version)
-AIRFLOW_V_2_7_PLUS = Version(AIRFLOW_VERSION.base_version) >= Version("2.7.0")
 AIRFLOW_V_2_8_PLUS = Version(AIRFLOW_VERSION.base_version) >= Version("2.8.0")
 AIRFLOW_V_2_9_PLUS = Version(AIRFLOW_VERSION.base_version) >= Version("2.9.0")
 AIRFLOW_V_2_10_PLUS = Version(AIRFLOW_VERSION.base_version) >= Version("2.10.0")