DOCS-818: Expand Target DNS guidance

[harrison-akeyless]

Summary

• add an Azure DNS managed identity example for Let's Encrypt DNS-01 flows
• document how to create an Azure target with Gateway cloud identity
• add an Azure DNS challenge troubleshooting checklist

Validation

• npx markdownlint-cli2 --fix --config .github/markdownlint/.markdownlint-cli2.yaml --no-globs "docs/Secrets Management/targets/lets-encrypt.md"
• npx markdownlint-cli2 --config .github/markdownlint/.markdownlint-cli2.yaml --no-globs "docs/Secrets Management/targets/lets-encrypt.md"
• npx cspell --config cspell.config.yaml --no-progress "docs/Secrets Management/targets/lets-encrypt.md"
• lychee --verbose --no-progress --exclude-file ".github/lychee/.lycheeignore" --exclude-path ".github" --exclude-link-local --exclude-loopback --include-mail "docs/Secrets Management/targets/lets-encrypt.md"

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📥 Commits

Reviewing files that changed from the base of the PR and between acfc19e and bcaa0b9.

📒 Files selected for processing (3)

• docs/Secrets Management/targets/digicert-target.md
• docs/Secrets Management/targets/google-ca-target.md
• docs/Secrets Management/targets/lets-encrypt.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v1.0_docs-818-lets-encrypt-azure-example

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[Avi-Akeyless]

@harrison-akeyless Looks good, just few notes:

1. We don't have the timeout option in the console so we can take it off (if it will be added to the target we'll add it to the doc).
2. Cloudflare is also supported from the consle, not only from the CLI, so the note about it can be removed and it can be added to the DNS provider list.
3. The "Click Finish" step marked as 1, and it's the last step for creating the target from the console.