Add support for vendor-suffixed x-ndjson media types in Jackson JSON …

[catturtle123]

This PR addresses issue #36121

Summary

• Improved JacksonJsonDecoder to natively support the application/*+x-ndjson media type.
• Added tests to verify that vendor-suffixed NDJSON types (e.g., application/vnd.example.v1+x-ndjson) are correctly decoded out-of-the-box.
• Confirmed that custom components are no longer required to handle various NDJSON media types.

Resolved Issue

• Ensured that JacksonJsonDecoder and related codecs can handle all application/*+x-ndjson types, including vendor-specific variants, without additional configuration.
• Prevents regressions by covering these cases in the test suite.

Integration Test

I’ve added an integration test for this behavior. If needed, I can include it in the PR as well.

[bclozel]

Declining, see #36121 (comment)