[Workflows] Data and error handling

[nastasha-solomon]

Summary

Fixes #4654.

• The "Data and error handling" page covers the general flow of data through workflows, error handling, and how to insert dynamic values with templating.
• The "Templating engine" page covers what the workflow templating engine is. It describes templating engine syntax, provides examples of how to apply templates, and explains how templates process data structures, nested objects, and arrays.

Previews

• Data and error handling
• Templating engine

To find these pages in the left nav, go to Elastic Docs > Explore and analyze > Workflows

NOTE:

• These previews are static deployments generated via netlify – they won't get auto-updated when new commits are pushed to the PR.
• These previews are deployments of the Explore and analyze section – pages outside of this section are not available to preview.

Generative AI disclosure

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

• Yes
• No

Cursor, claude-4.5-opus-high

[github-actions]

Vale Linting Results

Summary: 3 suggestions found

💡 Suggestions (3)

File	Line	Rule	Message
explore-analyze/workflows/data.md	148	Elastic.WordChoice	Consider using 'run, start' instead of 'execute', unless the term is in the UI.
explore-analyze/workflows/data.md	174	Elastic.WordChoice	Consider using 'run, start' instead of 'execute', unless the term is in the UI.
explore-analyze/workflows/data.md	199	Elastic.Wordiness	Consider using 'continue' instead of 'Continue on'.

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[vishaangelova]

1st pass (review of /workflows/data.md)

[vishaangelova]

2nd pass (review of /workflows/data/templating.md)

This all makes sense! ⭐

(I see the templating.md doc is more of a reference about the different syntax patterns, and less about the use cases in which they can be used… but I still think the data.md could use the additional descriptions about the use cases.)

[vishaangelova]

LGTM! 🚀

[nastasha-solomon]

Additional changes to this content can be made in #4758.