[INLONG-8671][Manager] Fix no method parameter of form data in POST request

[vernedeng]

Prepare a Pull Request

• Fixes [Bug][Manager] Find no method parameter of form data in POST request #8671

Motivation

Find no method parameter data iff the request is POST method and use x-www-form-urlencoded format.

This bug is due to the InlongRequestWrapper only parse the data in query string as the parameters.
But in HTTP standards, the x-www-form-urlencoded format with POST method request should parse the body as the parameters too.

Modifications

1. Parse parameterMap as HTTP standard first.
2. Adjust the order of parameter parsing and body parsing.

Verifying this change

(Please pick either of the following options)

• This change is a trivial rework/code cleanup without any test coverage.

• This change is already covered by existing tests, such as:
  (please describe tests)

• This change added tests and can be verified as follows:

  (example:)

  • Added integration tests for end-to-end deployment with large payloads (10MB)
  • Extended integration test for recovery after broker failure

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a follow-up issue for adding the documentation