Add cloud integration CI test foundation

[sdairs]

Summary

Build out the initial cloud integration CI testing foundation for clickhousectl.

This adds a live-cloud Rust integration test harness that exercises the built CLI binary, a dedicated GitHub Actions workflow, and an expanded service lifecycle flow with structured output and capability checks.

What changed

• add a cloud integration workflow for manual/nightly runs
• add a Rust integration test harness under tests/
• exercise the built clickhousectl binary rather than internal handlers
• add a service lifecycle flow covering:
  • org checks
  • service create/get/list
  • rename + readback verification
  • stop/start
  • explicit delete
  • scaling transitions
• add non-blocking capability checks with CONTINUE_ON_NON_BLOCKING_FAILURES=1
• improve output so runs are readable and easier to inspect from CI logs
• redact org/service identifiers from the harness logs
• document how to run the cloud integration suite locally

Verification

cargo test --test cloud_cli -- --ignored --list

Live test runs were also used during development to validate the harness behavior.

Known follow-ups

Issues raised from live runs:

• cloud service update tag patch serializes tags as array and is rejected by API #36 cloud service tag update serializes tags as an array and is rejected by the API
• cloud service delete prints plain text with --json and breaks JSON consumers #37 cloud service delete prints plain text with --json
• cloud org usage rejects documented timestamp format and fails on empty costs response #38 cloud org usage rejects documented timestamp format and fails on empty costs response

[Copilot]

Pull request overview

This PR introduces a real-cloud integration testing foundation for clickhousectl, including an ignored Rust test harness that exercises the built CLI binary, plus a scheduled/manual GitHub Actions workflow to run it against live ClickHouse Cloud.

Changes:

• Added a Rust integration test harness under tests/cloud_cli/ with structured step logging, polling helpers, and best-effort cleanup.
• Added a live service CRUD lifecycle test that provisions, updates, scales, and deletes a cloud service via the clickhousectl cloud --json CLI.
• Added a dedicated Cloud Integration GitHub Actions workflow and documented how to run the suite locally.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/cloud_cli/support.rs	Implements the CLI runner, step/failure recording, polling, cleanup, and redaction helpers for the live-cloud harness.
tests/cloud_cli/service_crud.rs	Adds the end-to-end service lifecycle integration test (ignored by default) using the support harness.
tests/cloud_cli.rs	Wires the integration test modules into a single integration test target.
README.md	Documents required env vars and how to run the cloud integration suite locally.
.github/workflows/cloud-integration.yml	Adds scheduled/manual CI workflow to build the binary and run the ignored live-cloud test.

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