chore: correct GCP references in Azure Container Apps docs

[ava-silver]

What does this PR do? What is the motivation?

Fixes Google Cloud references that were leaking into the Azure Container Apps docs through shortcodes shared with Cloud Run:

• serverless-init-configure: the DD_API_KEY guidance now says "Container Apps secret" for Container Apps and keeps "Google Cloud Secret" for Cloud Run.
• Container Apps Node.js sidecar page passed productNames="Cloud Run services"; corrected to "Azure Container Apps".
• serverless-init-env-vars-sidecar: added the required DD_AZURE_SUBSCRIPTION_ID and DD_AZURE_RESOURCE_GROUP rows for Container Apps, matching the in-container table and the sidecar install steps.

Merge readiness

• Ready for merge

For Datadog employees:

• ⚠️ Your branch name MUST follow the <name>/<description> convention and include the forward slash (/).
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AI assistance

Used Claude Code to audit the shared serverless-init shortcodes and apply the fixes.

Additional notes

[ava-silver]

• chore: correct GCP references in Azure Container Apps docs #38081 👈 (View in Graphite)
• master

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[ava-silver]

/review

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/ava.silver/chore/correct-gcp-references-in-azure-container-apps-docs/serverless/azure_container_apps/sidecar/nodejs

[github-actions]

🤖 Automated review by Claude. AI-generated; verify before acting.

Overall the changes look correct and consistent with the other Azure Container Apps sidecar pages.

One follow-up outside this diff (blocker for this PR's goal): content/en/serverless/azure_container_apps/sidecar/nodejs.md:95 still calls the shortcode with defaultSource="cloudrun":

{{% serverless-init-env-vars-sidecar language="nodejs" defaultSource="cloudrun" %}}

Every other azure_container_apps/sidecar/*.md page uses defaultSource="containerapp". Because the new DD_AZURE_SUBSCRIPTION_ID / DD_AZURE_RESOURCE_GROUP rows added here are gated on defaultSource == "containerapp", they will not appear on the Node.js Azure Container Apps page, and the documented default for DD_SOURCE on that page will incorrectly remain cloudrun. Updating that line to defaultSource="containerapp" is likely required to make this PR's intent take effect.

_{Reviewed e04a8c9a50549dbf0a7ef6deef1fb61846b1ff2a — workflow run}

[estherk15]

Thanks for the update!