[doc](observability) Document current query runtime statistics and progress monitoring (#60567)

[wenzhenghu]

Update documentation for the unified current query runtime statistics feature
(apache/doris#60567):

• Update query-profile-action.md: expand current_queries endpoint response with
  new columns (scan/cpu/memory/shuffle/spill/cache metrics, task progress) and
  add new fields (processRows, totalTasksNum, finishedTasksNum, progress,
  bytesWriteIntoCache) to statistics/{trace_id} endpoint
• Update SHOW-PROC.md: reflect that current_queries and current_query_stmts
  now share the same enriched statistics view since 4.1.1
• Add query-progress-monitor.md: new document explaining how to monitor running
  queries with runtime statistics via SHOW PROC, REST API, and Trace ID,
  including example output and column descriptions
• Update sidebar configuration to include the new document

Versions

• dev
• 4.x
• 3.x
• 2.1 or older (not covered by version/language sync gate)

Languages

• Chinese
• English
• Japanese candidate translation needed

Docs Checklist

• Checked by AI
• Test Cases Built
• Updated required version and language counterparts, or explained why not
• If only one language changed, confirmed whether source/translation counterparts need sync