Add deprecation notices that missed the 14.9.0 release tag

Merged Fabian Zimmer requested to merge enablement-deprecations-patch-1 into 14-9-stable-ee-patch-1

What does this MR do and why?

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This MR adds three deprecation items that were not included in the initial 14.9.0 release. We need to include them so that they get shipped as part of the EE docs.

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Edited by Fabian Zimmer