CodeGen from PR 14079 in Azure/azure-rest-api-specs

Kusto pools principal assignment (#14079)

* kustoPool PrincipalAssignments

* fixed list principal assignments

* principalAssignment list example

* principalAssignment get example

* KustoPoolPrincipalAssignmentsCreateOrUpdate

* KustoPoolPrincipalAssignmentsDelete

* databases PrincipalAssignments

* minor change

* KustoPoolDatabasePrincipalAssignmentsList

* KustoDatabasePrincipalAssignmentsGet

* KustoPoolDatabasePrincipalAssignmentsCreateOrUpdate

* KustoPoolDatabasePrincipalAssignmentsDelete

* fixed example ref

* added system data

* kustoPoolCheckNameAvailability

* KustoPoolsCheckNameAvailability example

Co-authored-by: Itay Sofer <itsofer@microsoft.com>

Author: SDKAuto