[Workflows] Document historical execution time-range filter

[nastasha-solomon]

Summary

Documents the new time-range filter for historical replay, added in Kibana elastic/kibana#266706 (9.5). Previously, the Run again / Run step again replay flow (selecting a past execution to reuse as input for a new run or step test) wasn't documented anywhere in docs-content, so the new filter had nowhere to live either.

Adds a new section, "Filter historical executions by time range," to the Monitor workflow execution page:

• Explains what Run again and Run step again do
• Documents the time-range filter next to the execution picker, defaulting to the last week through now
• Documents the anchor behavior when replay is opened from a specific execution (the range end is set to that run's start time)
• Documents what happens if you narrow the range so the selected execution falls out of it (the selection is cleared)

Fixes #7350.

Previews

• Monitor workflow execution | Filter historical executions by time range: New section covering the time-range filter and anchor behavior.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes - Claude Code
• No

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🔍 Preview links for changed docs

• explore-analyze/workflows/authoring-techniques/monitor-workflows.md

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