HDDS-15304. DeleteObjects should enforce the request key limit

[sreejasahithi]

What changes were proposed in this pull request?

The multi object delete iterates all request entries and forwards them to bucket.deleteKeys without checking the S3 1000 key maximum limit.
It should reject DeleteObjects requests with more than 1000 objects before execution and return the error.

What is the link to the Apache JIRA

HDDS-15304

How was this patch tested?

Added testcases
Green CI : https://github.com/sreejasahithi/ozone/actions/runs/26077522597

[sreejasahithi]

@peterxcli could you please review this patch.

[peterxcli]

LGTM +1
https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html#:~:text=The%20request%20can%20contain,you%20want%20to%20delete

[sreejasahithi]

Sample output after the fix.

bash-5.1$ 
bash-5.1$ 
bash-5.1$ aws s3api delete-objects \
 --bucket test-delete-limit \
 --delete "$(python3 -c "
import json
keys = [{'Key': f'key-{i}'} for i in range(1, 1002)]
print(json.dumps({'Objects': keys, 'Quiet': False}))
")" \
 --endpoint-url http://localhost:9878/

An error occurred (MalformedXML) when calling the DeleteObjects operation: The XML you provided was not well-formed or did not validate against our published schema
bash-5.1$ 
bash-5.1$ 
bash-5.1$ aws s3api delete-objects \
 --bucket test-delete-limit \
 --delete "$(python3 -c "
import json
keys = [{'Key': f'key-{i}'} for i in range(1, 1000)]
print(json.dumps({'Objects': keys, 'Quiet': False}))
")" \
 --endpoint-url http://localhost:9878/
{
  "Deleted": [
    {
      "Key": "key-1"
    },
    {
      "Key": "key-2"
    },
    {
      "Key": "key-3"
    },
    {
      "Key": "key-4"
    },
    {
      "Key": "key-5"
    },
    {
      "Key": "key-6"
    },
    {
      "Key": "key-7"
    },
    {
      "Key": "key-8"
    },
    {
      "Key": "key-9"

[peterxcli]

I think we should throw clear exception

Suggested change

	throw newError(S3ErrorTable.MALFORMED_XML, bucketName);
	throw newError(S3ErrorTable.INVALID_ARGUMENT, "too many objects");