[AIRFLOW-7041] make bowler dependency local (#7691)

backport_packages/.flake8

@@ -0,0 +1 @@
+../.flake8

backport_packages/setup_backport_packages.py

@@ -29,12 +29,8 @@
 from shutil import copyfile, copytree, rmtree
 from typing import Dict, List
 
-from bowler import LN, TOKEN, BowlerTool, Capture, Filename, Query
-from fissix.pytree import Leaf
 from setuptools import Command, find_packages, setup as setuptools_setup
 
-BowlerTool.IN_PROCESS = True
-
 logger = logging.getLogger(__name__)
 
 # Kept manually in sync with airflow.__version__
@@ -143,6 +139,20 @@ def run(self):
 
 
 def change_import_paths_to_deprecated():
+    from bowler import LN, TOKEN, Capture, Filename, Query
+    from fissix.pytree import Leaf
+
+    def remove_tags_modifier(node: LN, capture: Capture, filename: Filename) -> None:
+        for node in capture['function_arguments'][0].post_order():
+            if isinstance(node, Leaf) and node.value == "tags" and node.type == TOKEN.NAME:
+                if node.parent.next_sibling and node.parent.next_sibling.value == ",":
+                    node.parent.next_sibling.remove()
+                node.parent.remove()
+
+    def pure_airflow_models_filter(node: LN, capture: Capture, filename: Filename) -> bool:
+        """Check if select is exactly [airflow, . , models]"""
+        return len([ch for ch in node.children[1].leaves()]) == 3
+
     changes = [
         ("airflow.operators.bash", "airflow.operators.bash_operator"),
         ("airflow.operators.python", "airflow.operators.python_operator"),
@@ -194,19 +204,6 @@ def change_import_paths_to_deprecated():
     qry.execute(write=True, silent=False, interactive=False)
 
 
-def remove_tags_modifier(node: LN, capture: Capture, filename: Filename) -> None:
-    for node in capture['function_arguments'][0].post_order():
-        if isinstance(node, Leaf) and node.value == "tags" and node.type == TOKEN.NAME:
-            if node.parent.next_sibling and node.parent.next_sibling.value == ",":
-                node.parent.next_sibling.remove()
-            node.parent.remove()
-
-
-def pure_airflow_models_filter(node: LN, capture: Capture, filename: Filename) -> bool:
-    """Check if select is exactly [airflow, . , models]"""
-    return len([ch for ch in node.children[1].leaves()]) == 3
-
-
 def copy_provider_sources():
     build_dir = os.path.join(dirname(__file__), "build")
     if os.path.isdir(build_dir):