add warning msg to az sig image-version create/update

Author: naga-nandyala

.gitignore

@@ -122,3 +122,5 @@ cmd_coverage/*
 
 # Ignore test results
 test_results.xml
+
+_scratch*

src/azure-cli/azure/cli/command_modules/vm/custom.py

@@ -5341,6 +5341,13 @@ def create_image_version(cmd, resource_group_name, gallery_name, gallery_image_n
     from azure.mgmt.core.tools import resource_id, is_valid_resource_id
     from azure.cli.core.commands.client_factory import get_subscription_id
 
+    # Display warning about API version 2026-03-03 changes
+    logger.warning("Starting api-version 2026-03-03, gallery image versions will default to:\n"
+                   "  - endOfLifeDate = 6 months from publish date (unless explicitly set)\n"
+                   "  - blockDeletionBeforeEndOfLife = true (unless explicitly set)\n"
+                   "By default, image deletion is blocked for 6 months. "
+                   "To override, set a custom endOfLifeDate or set blockDeletionBeforeEndOfLife = false")
+
     location = location or _get_resource_group_location(cmd.cli_ctx, resource_group_name)
     end_of_life_date = fix_gallery_image_date_info(end_of_life_date)
     if managed_image and not is_valid_resource_id(managed_image):
@@ -5555,6 +5562,13 @@ def update_image_version(cmd, resource_group_name, gallery_name, gallery_image_n
     from .operations.sig_image_version import convert_show_result_to_snake_case
     args = convert_show_result_to_snake_case(args)
 
+    # Display warning about API version 2026-03-03 changes
+    logger.warning("Starting api-version 2026-03-03, gallery image versions will default to:\n"
+                   "  - endOfLifeDate = 6 months from publish date (unless explicitly set)\n"
+                   "  - blockDeletionBeforeEndOfLife = true (unless explicitly set)\n"
+                   "By default, image deletion is blocked for 6 months. "
+                   "To override, set a custom endOfLifeDate or set blockDeletionBeforeEndOfLife = false")
+
     if target_regions:
         if "publishing_profile" not in args:
             args["publishing_profile"] = {}