Populate KongUpstreamPolicy status for every attached object in the controller

[czeslavo]

Problem Statement

When KongUpstreamPolicy is attached to an object (Service or GW API *Route) using the konghq.com/upstream-policy, the controller should populate its status accordingly:

• When Service is annotated and used in GW API rule with multiple backend refs, but their konghq.com/upstream-policy annotations do not match, status.ancestors is populated with Accepted condition with status Conflicted
• The condition Accepted is set with Value "True" and Reason=Accepted if Service is annotated and the above condition does not happen

Ensure that envtests covering the controller are added that will mock successful config update and will ensure that conditions are properly populated.

Proposed solution

A new controller watches KongUpstreamPolicy, Service, and *Routes and set the KongUpstreamPolicy status according to the above rules.

Acceptance criteria

• status.ancestors slice is populated with one entry per each KongUpstreamPolicy-associated object

[czeslavo]

Moving to KIC v3.1.0 milestone as we decided to not implement status in 3.0.