feat(trait): Add metricType support to the KEDA trait triggers

[wojciechgrazawskiahnl]

This PR adds support for specifying a trigger-level metricType in the KEDA trait, mapping to KEDA's ScaleTriggers.metricType field (Utilization, AverageValue or Value).

This is required for compatibility with KEDA v2.18+, which removed the deprecated metadata.type field for the cpu and memory scalers. Without a way to set the trigger-level metricType, those scalers can no longer be configured through the KEDA trait on recent KEDA versions.

Changes

• Added the MetricType field to KedaTrigger (pkg/apis/camel/v1/trait/keda.go), exposed as the metric-type trait property and validated against the enum Utilization/AverageValue/Value.
• Added the MetricType field to the KEDA duck type ScaleTriggers (pkg/apis/duck/keda/v1alpha1/duck_types.go).
• Propagated MetricType from the trait trigger to the generated ScaledObject triggers (pkg/trait/keda.go).
• Regenerated CRDs and API docs.
• Added TestKedaMetricType covering a cpu trigger with metricType: Utilization.

Example

traits:
  keda:
    triggers:
      - type: cpu
        metricType: Utilization
        metadata:
          value: "70"

Release Note

Add metricType support to the KEDA trait triggers (required for cpu/memory scalers on KEDA v2.18+).

[squakez]

LGTM, thanks! Just a minor comment change if you wish to apply.

[wojciechgrazawskiahnl]

LGTM, thanks! Just a minor comment change if you wish to apply.

Is there a chance to include it in 2.11.0 release ?

[squakez]

LGTM, thanks! Just a minor comment change if you wish to apply.

Is there a chance to include it in 2.11.0 release ?

Yes, for sure.

[wojciechgrazawskiahnl]

@squakez
Could you please re-run the workflow one more time? The earlier failure was because my fork had fallen behind — I've now rebased the branch onto the latest upstream main, so it should be green.

[wojciechgrazawskiahnl]

@squakez
Seems failure of this job is not related to my changes https://github.com/apache/camel-k/actions/runs/30986861500/job/92246567792?pr=6740, can You please re-trigger it ?

[squakez]

Checks failure unrelated. Merging.