Reduce Copilot review noise by omitting empty severity sections

[Copilot]

Visual review comments were always rendering BLOCKING/WARNING/INFO headings even when no issues existed, cluttering PRs with empty sections.

• Update shared review template to skip severity sections with zero items and fall back to the existing “No issues found. All pages pass visual review.” snippet when nothing is reported.
• Preserve existing severity definitions and formatting while reducing blank headings in Copilot-generated reviews.

Example:

### Issues Found

#### BLOCKING
- **path:line** — Description

#### WARNING
- **path:line** — Description

(Only included severities with findings; all omitted when no issues exist.)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gitlab.com
  • Triggering command: /usr/libexec/docker/cli-plugins/docker-buildx /usr/libexec/docker/cli-plugins/docker-buildx bake --file - --progress rawjson --metadata-file /tmp/compose-build-metadataFile-2137598446.json --allow fs.read=/home/REDACTED/work/docs-v2/docs-v2 (dns block)
• repos.influxdata.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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