feat: add kusto_eventhub_data_connection supports retrieval_start_date parameter

[FakieHeelflip]

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Description

Add for the kusto_eventhub_data_connection the parameter "retrieval_start_date" to ingest older stored data from an Event Hub.

When defined, the data connection retrieves existing Event hub events created since the Retrieval start date. It can only retrieve events retained by the Event hub, based on its retention period.

• add the missing parameter for CRUD
• add test case for the new parameter
• add updated docs

Made CRUD tests locally.

PR Checklist

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Changes to existing Resource / Data Source

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Testing

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Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_kusto_eventhub_data_connection - support the retrieval_start_date parameter

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

No known open issue for that.

[FakieHeelflip]

Besides, it is not clear to me what tests you need from me to approve that PR.

[FakieHeelflip]

Thank you for triggering the checks. There were indeed a format errors (spaces) in the Terraform blocks of the website documentation and in the test file for the azurerm_kusto_eventhub_data_connection. Used terraform fmt for both of the resource blocks to fix.