Migrate event recorder to event/v1

[adri1197]

Migrate the source-controller event recorder from event/v1beta1 to event/v1, using the events.EventRecorder interface from fluxcd/pkg/runtime/events.

Changes

• Replace k8s.io/client-go/tools/record.EventRecorder with fluxcd/pkg/runtime/events.EventRecorder across all controllers and the summarize package.
• Update event API import from fluxcd/pkg/apis/event/v1beta1 to fluxcd/pkg/apis/event/v1.
• Adapt all Eventf and AnnotatedEventf call sites to the new v1 signature, which requires additional action and reportingController parameters.
• Inline the mustSetupEventRecorder helper in main.go since the new events.NewRecorder returns a different type.
• Update all corresponding test files to use the new recorder interface.

Motivation

The event/v1beta1 API is being deprecated in favor of event/v1.

Closes fluxcd/flux2#5761