Add Prometheus Service to update action in Projects::Settings::Operations controller
What does this MR do?
Implements #200019 (closed)
It extends Projects::Settings::Operations#update
action. It will accept nested attributes for PrometheuService
entry and create or update it attributes based on it.
It is one of a steps required to move Prometheus from Settings > Integrations to Settings > Operations and is a part of #24651 (closed) Whole moved section will be hidden behind feature flag
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