[Dashboards] Fix is_column_break issues

[DavidRobertAnsart]

Changes

• This PR fix 2 issues:

  1. is_column_break is optional and should not be set for screenboards:
     The fix is to not add the is_column_break attribute when the value is false. It seems that even if the optional value is not provided, Terraform set its by default to false.

  2. Fix an infinite apply plan with the is_column_break attribute:
     When adding is_column_break to true, the internal TF state dont save it, leading to an infinite plan. This PR save the attribute value in the TF state.

• Add tests for the Multi-size layout reflow_type property and the is_column_break attribute.

View the changes

I updated lots of cassettes because the is_column_break is not in the dashboard payload by default now.

The first file datadog/resource_datadog_dashboard.go and the last file datadog/tests/resource_datadog_dashboard_test.go are the only one I updated. To view them easily, collapse all files by holding down the alt key and clicking on the inverted caret icon in any file header. Then open only the first and the last file to review them.

[skarimo]

Could you add a test case for is_column_break: true. Thanks!

[DavidRobertAnsart]

Could you add a test case for is_column_break: true. Thanks!

Done !

[jirikuncar]

/azp run

[azure-pipelines]

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