help: add space for outputs and processors when generating schema.

[pwhelan]

Description

This is a backport of #11020 to 4.0.

Problem

The output plugins are not appearing in the JSON output from when generating fluent-bit schema via ./bin/calyptia-fluent-bit -J.

Root Cause

In flb/src/flb_help.c:717, the root msgpack map was initialized with size 5:
msgpack_pack_map(&mp_pck, 5);

However, the code was actually adding 6 entries to the root map:

• fluent-bit
• customs
• inputs
• processors (this was missing from the comment)
• filters
• outputs

Because the map was declared with size 5, when msgpack tried to pack 6 entries, the 6th entry ("outputs") was being written to the buffer but wasn't properly included in the map structure, causing it to be silently dropped during JSON conversion.

Fix

Changed line 717 from msgpack_pack_map(&mp_pck, 5) to msgpack_pack_map(&mp_pck, 6) and updated the comment to reflect all 6 entries including "processors".
Verification
All 46 output plugins now appear in the JSON output
The JSON structure includes all 6 root keys: customs, filters, fluent-bit, inputs, outputs, and processors
No debug output is printed to stderr

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Enter [N/A] in the box, if an item is not applicable to your change.

Testing
Before we can approve your change; please submit the following in a comment:

• [N/A] Example configuration file for the change
• [N/A] Debug log output from testing the change
• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found

Documentation

• [N/A] Documentation required for this feature

Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pwhelan-fix-schema-outputs-4.0

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