Reduces number of parallel integration tests due to connection limits

[ryankfu]

What

Currently destination-snowflake is running into too many connections being established within 10 - 20 second window with the changes from #23506 . This is leading to consistent failures where setting a timeout will not alleviate the issue because the issue is not with the connections being held for too long but rather too many connections are being created in a short window

Future work is to have the number of parallel integration tests be set on the connector level since

How

Currently dividing the number of parallel integration tests by a factor of three to give a slight bit of headroom. Further investigation is needed to see if there's redundant tests, potentially a high number because of the way Snowflake loads data:

• Internal Staging
• S3 Staging
• GCS Staging
• AzureBlobStorage Staging

Recommended reading order

1. airbyte-integration-test-java.gradle

🚨 User Impact 🚨

Are there any breaking changes? What is the end result perceived by the user? If yes, please merge this PR with the 🚨🚨 emoji so changelog authors can further highlight this if needed

No user impact, if anything will still allow our integration tests to run in parallel without blocking future development.

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[ryankfu]

Closing due to #23870 creating a configurable property with number of max threads to execute