Remove slack notifications from Optimize GH actions

[misiekhardcore]

Acceptance Criteria (Required on creation)

Many of Optimize GH workflows use notify-on-slack action to post an error summary when workflow fails. However, all the workflows which have that action added, are also part of the health report. To remove redundant duplication in messaging and as notify-on-slack action does not bring any additional value, we are removing it from all the Optimize workflows.

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1. https://github.com/camunda/camunda-optimize/pull/14389

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