Set custom Apdex for triggerable integrations API endpoints
What does this MR do and why?
The ".../trigger"
endpoints in the integrations API call external services, so we lower the Apdex urgency to low
for these endpoints.
See: https://gitlab.com/gitlab-org/gitlab/-/issues/343602 and https://gitlab.com/gitlab-org/gitlab/-/issues/343602#note_716569607.
MR acceptance checklist
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Related to #343602