Add queue time SLO to the SLA

Miroslav Vadkertirequested to merge
sla-queue-time into main

Testing Farm aims to start processing every request within 1 hour of its submission. Document the queue time SLO next to the API uptime and error rate SLOs and link to the metrics dashboard.

Assisted-by: Claude Code Signed-off-by: Miroslav Vadkerti mvadkert@redhat.com

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