What and why?

Adds Cloud Run e2e coverage for SVLS-7937 so datadog-ci validates the real instrument and uninstrument flow against an ephemeral Cloud Run service.

How?

• Adds an Ubuntu Cloud Run e2e test that deploys a temporary service from the public Google hello image, instruments it, verifies the service config, uninstrument it, verifies cleanup, and deletes the service.
• Adds a Cloud Run verifier for the Datadog sidecar, serverless-init image, shared volume, required DD environment variables, and instrumentation labels.
• Gates Cloud Run e2e execution behind a Cloud Run path filter and conditionally configures Google Cloud OIDC plus gcloud in CI.
• Skips Cloud Run e2e on Windows and standalone binary runs.
• Extends e2e helpers with transient GCP retry patterns and quoted e2e/.env.local value parsing.
• Adds CODEOWNERS coverage for the new Cloud Run e2e files.

Test plan

• Manual Cloud Run e2e with GCP_PROJECT_ID, GCP_REGION, and DATADOG_CI_COMMAND configured: yarn jest --config jest.config-e2e.js e2e/cloud-run.test.ts --colors

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)