Exclude secondary Markdown output files from sitemap

[parlough]

Fixes #7017

[gemini-code-assist]

Summary of Changes

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This pull request resolves an issue where intermediate Markdown output files were inadvertently included in the sitemap for the dart.dev website. The change introduces a new exclusion rule in the site build configuration, ensuring that only relevant, public-facing content is listed in the sitemap, thereby improving its accuracy and utility.

Highlights

• Sitemap Generation: The site build command has been updated to explicitly exclude secondary Markdown output files from the sitemap. This prevents files with the .html.md extension from being included in the dart.dev sitemap.

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[gemini-code-assist]

Code Review

This pull request correctly excludes secondary Markdown output files from the sitemap by adding the --sitemap-exclude argument to the build command. The implementation is straightforward and correct. My review includes one suggestion to improve code maintainability by replacing the hardcoded argument string with a named constant.

[dart-github-bot]

Visit the preview URL for this PR (updated for commit ccb364e):

https://dart-dev--pr7018-fix-7017-lai86363.web.app