Restructure Synthetics Notifications - Template Variables

[git-thuerk-done]

What does this PR do? What is the motivation?

Synthetics Template Variables Documentation Refactor

• Completely restructured the template variables page to separate data from presentation:
• New Data File: data/synthetics/template_variables.yaml
• Contains all 100+ template variable definitions in structured YAML format
• Organized into sections: test_execution, result_variables, step_extracted_variables, step_summary

Easier to maintain, validate, and potentially generate from code
New Partials:

1. layouts/partials/synthetics/template-variables-execution.html - Renders test execution variables
2. layouts/partials/synthetics/template-variables-result.html - Renders result variables
3. layouts/partials/synthetics/template-variables-steps.html - Renders step extracted variables
4. layouts/partials/synthetics/template-variables-summary.html - Renders step summary
5. Updated: content/en/synthetics/notifications/template_variables.md

Uses partials to render variable documentation from the YAML data file

• Section headings remain in markdown for proper table of contents generation

Benefits of Template Variables Refactor

1. Maintainability: Variable data is now in one structured YAML file
2. Reusability: Data can be used by other templates or tooling
3. Validation: YAML structure can be validated/linted
4. Localization: Easier to create translated versions of the data file
5. Cleaner content: Markdown file focuses on narrative content while partials handle rendering

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/aliciathuerk/restructure-notifications/synthetics/notifications/template_variables

[git-thuerk-done]

Replaced by #33630