Fix command registration: Update __init__.py files to import all subcommands

- Update neon/__init__.py to import all command groups (branch, compute, endpoint, etc.)
- Update aaz package __init__.py files to properly import modules
- This fixes the AAZ validation errors for missing command groups

Fixes the error: 'Miss command groups in aaz: az neon branch, az neon compute...'

Author: Bhargavsaichinni

src/neon/azext_neon/aaz/__init__.py

@@ -4,3 +4,5 @@
 #
 # Code generated by aaz-dev-tools
 # --------------------------------------------------------------------------------------------
+
+from . import latest

src/neon/azext_neon/aaz/latest/__init__.py

@@ -8,3 +8,4 @@
 # pylint: skip-file
 # flake8: noqa
 
+from . import neon

src/neon/azext_neon/aaz/latest/neon/__init__.py

@@ -10,3 +10,10 @@
 
 from .__cmd_group import *
 from ._create import *
+from . import branch
+from . import compute
+from . import endpoint
+from . import neon_database
+from . import neon_role
+from . import organization
+from . import project