[Integration Spec] Update docs/integration-jdbc.md

[chernser]

Summary

Followup PR for comments.

https://github.com/ClickHouse/clickhouse-java/pull/2914/changes#r3594185661

Lets add step 8 in with:

    Docker setup for local clickhouse
    cloud environment - partners get credits to use
    reference to example test suites in our repo

we should make sure to highlight areas like:

    functional correctness: row count matches, data types, schema mismatch handling
    potential failure paths: idempotent inserts, retryable vs non-retryable, long operation failures
    latency vs throughput vs part count
    client_name, logging enabled
    cloud readiness: idle instance handling, long running query failures
    automated testing against the different channels in CH cloud for version support

Docker setup and cloud environment - added as "Development environment" section.
References to example test suites will be in another document. Currently we have many examples inline.

functional correctness - covered in Failure handling in Select and Insert operations
potential failure paths
- idempotent inserts - covered in "Idempotency — deduplication token"
- what is retryable - covered in failure handling section for each operation
- long operations failures

client_name - covered in "Workload identification" section

Checklist

Delete items not relevant to your PR:

• Closes #
• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials