Set low Apdex SLO for slow API v3 endpoints

Luke Duncalferequested to merge
349847-mark-integrations-api-endpoints-as-low-urgency into master

What does this MR do and why?

This MR sets the Apdex SLO for two API endpoints to urgency: :low. This is intended to be a temporary measure while ~"group::integrations" can schedule optimising the endpoints #349847 (comment 808816711).

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #349847 (closed)

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