docs: Update greptime_identity pipeline for automatic flattening and max_nested_levels

[Copilot]

What's Changed in this PR

Updated documentation to reflect breaking changes in greptime_identity pipeline from greptimedb#6932:

Breaking Changes:

• Removed flatten_json_object parameter - flattening is now always enabled
• Arrays now convert to JSON strings instead of JSON type
• Objects automatically flatten using dot notation (e.g., {"a":{"b":1}} → column a.b)

New Features:

• Added max_nested_levels parameter (default: 10) to control flattening depth
• When depth limit reached, remaining nested structures serialize to JSON strings instead of throwing errors

Updated Examples:

# Old (removed)
-H "x-greptime-pipeline-params: flatten_json_object=true"

# New
-H "x-greptime-pipeline-params: max_nested_levels=10"

Files Updated:

• Built-in pipelines reference (EN/ZH)
• Vector integration examples (EN/ZH)
• Current docs and version 0.17 (version 0.16 and older unchanged)

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Update docs for feat: improve greptime_identity pipeline behavior</issue_title>
<issue_description>A document change request is generated from GreptimeTeam/greptimedb#6932</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update docs for feat: improve greptime_identity pipeline behavior #2105

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[fengjiachun]

LGTM

[discord9]

LGTK