Update trigger.spec.filters to the latest subscription API filters

[pierDipi]

Problem

The subscription API has been updated to improve the UX in https://github.com/cloudevents/spec/pull/957

We should update the new-trigger-filter experimental feature to reflect that.

Persona: Which persona is this feature for? Event consumer

Exit Criteria

A measurable (binary) test that would indicate that the problem has been resolved.

Time Estimate (optional): How many developer-days do you think this may take to resolve? 2

Additional context (optional)

/area brokers

[github-actions[bot]]

This issue is stale because it has been open for 90 days with no activity. It will automatically close after 30 more days of inactivity. Reopen the issue with /reopen. Mark the issue as fresh by adding the comment /remove-lifecycle stale.

[pierDipi]

/remove-lifecycle stale

[daisy-ycguo]

I would like to work on this issue. /assign

[pierDipi]

There is one missing update for https://github.com/knative/eventing/tree/main/pkg/eventfilter/subscriptionsapi to accept multiple entries for the updated filters (for example https://github.com/knative/eventing/blob/c884e27795f7db3caf44e69b128928450a7a6a54/pkg/eventfilter/subscriptionsapi/exact_filter.go#L39 accepts only one entry), so reopening for now.