azurerm_api_management_logger : support connection_string of application_insights

[sinbai]

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Description

Support for Application Insights connection_string in azurerm_api_management_logger

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

PASS: TestAccApiManagementLogger_applicationInsightsConnectionString (473.00s)

Change Log

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

• azurerm_api_management_logger - support for the connection_string of application_insights[Support for Application Insights Connection String in azurerm_api_management_logger #25750]

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)

Fixes #25750

[catriona-m]

Thanks @sinbai LGTM!