Fix whitespace diffs on logging_sink exclusion filters

[lyoung-confluent]

The top-level filter resource already has OptionalSurroundingSpacesSuppress, but the filter on exclusions does not causing unnecessary diffs when there only difference is leading/trailing whitespace, common because of the use of HEREDOC on this attribute.

[github-actions]

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[melinath]

Thanks for your contribution! This change will need to be made in https://github.com/GoogleCloudPlatform/magic-modules/blob/main/mmv1/third_party/terraform/services/logging/resource_logging_sink.go, which should be pretty a straightforward migration of the change you made.

[lyoung-confluent]

Thanks @melinath, I've opened GoogleCloudPlatform/magic-modules#11900

[github-actions]

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