refactor: replace (GVK, String) with KubeResourceId

[drmorr0]

Description and Rationale

• Replace all (GVK, String) tuples with an actual KubeResourceId struct: in feat!: update to versioned exported trace format #157 we started tracking GVKs in addition to namespaced-names for all kubernetes resources. These were just getting passed around as tuple values, here we replace those tuples with an actual struct, and update our custom resource trait to allow us to easily get the resource_id for a particular object. This should hopefully clean up some of our code (of particular note, we no longer need the format_gvk_name since this is an impl Display on the KubeResourceId type).

How

• The complicated/ugly bit of this is implementing the SkResourceExt trait for all T: kubeResource types in addition to DynamicObjects, which require looking up the GVK information at runtime instead of compile time. I had to do some ugly trait juggling in resource.rs with claude's help. Otherwise, it was just a lot of find/replacing.

Test Steps

• make test passes; some of the mock test fixtures were missing type data that was previously specified directly in the tests, and now has to be computed from the fixture instead, so I fixed those.

Other Notes

• changes to index.rs are more-or-less getting completely rewritten in the next PR in this stack, so i'm not that worried about performance or any other implications here.

• I added GVK, KubeResourceId, and SkResourceExt to the sk-core prelude, since it seems like we're using these in alot of places.

• I'm hoping/expecting that things like .spec() can get added to SkResourceExt so that we can get rid of the dyn_obj_spec/dyn_obj_spec_mut functions in k8s/util.rs.

• I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

[codecov]

Codecov Report

❌ Patch coverage is 97.20280% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.33%. Comparing base (5e6d043) to head (eb9cb4e).

Files with missing lines	Patch %	Lines
sk-core/src/k8s/owners.rs	95.00%	1 Missing ⚠️
sk-core/src/k8s/resource.rs	97.82%	1 Missing ⚠️
sk-driver/src/mutation.rs	80.00%	1 Missing ⚠️
sk-tracer/src/store.rs	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
+ Coverage   79.12%   79.33%   +0.21%     
==========================================
  Files          61       61              
  Lines        3995     4002       +7     
==========================================
+ Hits         3161     3175      +14     
+ Misses        834      827       -7     

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