[Fix][connector-http] fix parsing httpjson, the number of two fields is inconsistent with the import failure

[ocean-zhc]

…is inconsistent with the import failure

Purpose of this pull request

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[ocean-zhc]

#9093

[Copilot]

Pull Request Overview

This PR fixes the JSON parsing issue in the HTTP connector by ensuring that inconsistent field counts across JSON paths are handled gracefully. Instead of throwing an exception when field sizes differ, the code now calculates the maximum field count and pads shorter lists with null values.

• Removed strict size equality check across parsed JSON results.
• Introduced dynamic null-padding to standardize the size of each result list.
• Updated log messaging to warn users about padded fields.

Comments suppressed due to low confidence (1)

seatunnel-connectors-v2/connector-http/connector-http-base/src/main/java/org/apache/seatunnel/connectors/seatunnel/http/source/HttpSourceReader.java:273

• [nitpick] Consider combining the message string into a single literal with placeholders instead of using string concatenation, which improves readability and minimizes potential formatting issues.

                        "Field [{}] with size ({}) is less than max size ({}), will be padded with null values. " + "This may happen when JSON paths return different numbers of elements.",

[hailin0]

Please add test cases

[hailin0]

user mockserver mock api & response

https://github.com/apache/seatunnel/blob/dev/seatunnel-e2e/seatunnel-connector-v2-e2e/connector-http-e2e/src/test/resources/github_json_to_assert.conf#L26
https://github.com/apache/seatunnel/blob/dev/seatunnel-e2e/seatunnel-connector-v2-e2e/connector-http-e2e/src/test/resources/mockserver-config.json#L430