DOCS-854: expand Gateway certificate-store CLI reference

[harrison-akeyless]

Summary

• add explicit Certificate Store cross-link in the Gateway CLI reference
• add CLI example for Base64 certificate uploads (--certificate-data)
• add CLI example for multiple expiration notifications (--expiration-event-in)
• clarify PEM/DER behavior for --certificate-path and --certificate-data

Validation

• pre-commit run --files "docs/Integrations & Plugins/cli-reference/cli-reference-gateway/index.md"

Jira

• DOCS-854

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5000e32a-d0fb-48b3-8c9b-4ef04976fc5d

📥 Commits

Reviewing files that changed from the base of the PR and between 026f6a7 and b07705d.

📒 Files selected for processing (2)

• docs/Akeyless Gateway/configure-gateway/gateway-certificate-store.md
• docs/Integrations & Plugins/cli-reference/cli-reference-gateway/index.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v1.0_docs-854-gw-cert-store-cli-followup

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[Avi-Akeyless]

@harrison-akeyless

Can we just have the call out for not configuring only a single Gateway instance in a cluster, a bit less strong?

Other than that, looks great.

@EldadH89