Add sleep after pre-reqs

[ltellesfl]

Note

Low Risk
Low risk change that only adjusts Terraform apply ordering by inserting a fixed 1-minute delay; primary impact is slightly longer applies and potential masking of underlying readiness issues.

Overview
Adds a new time_sleep.wait_for_indico_pre_requisites (1 minute) after helm_release.indico_pre_requisites and wires it into the monitoring Helm release depends_on to reduce race conditions between pre-req installation and monitoring deployment.

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