don't re-create manifest and improve logging (#3995)

# Summary

comments are on the changesets

Author: nammn

pipeline.py

@@ -305,10 +305,6 @@ def copy_into_container(client, src, dst):
 
 def create_and_push_manifest(image: str, tag: str) -> None:
     final_manifest = image + ":" + tag
-    args = ["docker", "manifest", "rm", final_manifest]
-    args_str = " ".join(args)
-    logger.debug(f"removing existing manifest: {args_str}")
-    subprocess.run(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
     args = [
         "docker",

scripts/evergreen/release/images_signing.py

@@ -43,7 +43,7 @@ def run_command_with_retries(command, retries=6, base_delay=10):
         try:
             result = subprocess.run(command, capture_output=True, text=True, check=True)
             logger.debug(f"Command executed successfully with {attempt+1} attempts")
-            logger.debug(f"Command output: {result.stdout}")
+            logger.debug(f"Command: {command} has output: {result.stdout}")
             return result
         except subprocess.CalledProcessError as e:
             logger.error(f"Attempt {attempt + 1} failed: {e.stderr}")