[reorg fix] [DOCS-15196] Mark Download billable hosts as CSV unsupported on GovCloud sites

[jhgilbert]

🤖 Auto-generated fix for #38754.

@OliviaShoup — the docs repo reorg created merge conflicts in your PR #38754. This is an auto-generated replacement with the file paths fixed; please use it instead of the original.

This PR replays the commits from #38754 with file paths translated to the post-reorg hugo/ layout. The original commits are preserved — same messages and authorship.

The original PR (#38754) will be closed in favor of this one.

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• Ready for merge

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Original PR description:

What does this PR do? What is the motivation?

Fixes DOCS-15196
Fixes DOCS-15201

Adds a site-region banner to the Download billable hosts as CSV section of the Bill Overview page, noting that the feature is not supported on the US1-FED (gov) and US2-FED (gov2) sites.

DOCS-15196 and DOCS-15201 were filed separately for the GovCloud and US1-FED/US2-FED cases, but they describe the same gap on the same section, so one banner covers both.

The banner markup follows the existing pattern in content/en/account_management/billing/incident_response.md, the nearest sibling page in Plan & Usage.

Also fixes an unrelated double space in a bullet on the same page, which was the only Vale error in the file.

Merge readiness

• Ready for merge

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AI assistance

Claude Code drafted the banner wording and made the edit, including locating the existing site-region convention to match. Reviewed by me before commit.

Additional notes

The Usage Overview bullet list higher on the page still describes the Download Billable Hosts as CSV button without site gating. I left it as-is: site-region inside a list item is fragile, and the inverse approach (enumerating every commercial site) breaks whenever a new site is added. The banner appears immediately below that list.

Please confirm on the preview that the banner renders as expected with the site selector set to US1-FED and US2-FED.

[datadog-prod-us1-5]

⚠️ Warnings

🚦 3 Pipeline jobs failed

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Code Freeze is enabled. Job terminated with exit code 1 due to freeze being active during deployment.

DataDog/documentation | missing_tms_preview     

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FileNotFoundError: Template file 'local/bin/py/preview-links-template.mako' not found.

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