Genericize and consolidate kubectl delete operations

[jinnovation]

Relates to #69.

Currently, we define one function for delete-ing all entities of a given resource type, for each of a finite set of resources, e.g. k8s-kubectl-delete-{pods, nodes, ...}. All of these functions are identical save for the resource type that they retrieve.

As such, we generalize to a single implementation—k8s-kubectl-delete—that accepts the resource type name and performs the delete accordingly.

We additionally clean up unit tests and, finally, remove the granular, per-type get functions.

In particular, with regards to unit tests, we observe that, once the resource type name is abstracted away, there's no practical reason to have one test case for each resource type. As such, rather than consolidate all per-type test cases into a single test function, we simply keep one case for each of the two scenarios "delete success" and "delete fail," and remove the rest of the test functions as superfluous.

[codecov-commenter]

Codecov Report

Merging #198 (23a0c75) into master (96d9a6f) will decrease coverage by 0.66%.
The diff coverage is 16.12%.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   43.60%   42.94%   -0.67%     
==========================================
  Files          28       28              
  Lines        1509     1474      -35     
==========================================
- Hits          658      633      -25     
+ Misses        851      841      -10     

Impacted Files	Coverage Δ
kubernetes-configmaps.el	0.00% <0.00%> (ø)
kubernetes-deployments.el	0.00% <0.00%> (ø)
kubernetes-ingress.el	0.00% <0.00%> (ø)
kubernetes-jobs.el	19.35% <0.00%> (ø)
kubernetes-pods.el	10.71% <0.00%> (ø)
kubernetes-secrets.el	0.00% <0.00%> (ø)
kubernetes-services.el	0.00% <0.00%> (ø)
kubernetes-statefulsets.el	0.00% <0.00%> (ø)
kubernetes-kubectl.el	87.85% <100.00%> (+4.04%)	⬆️

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[noorul]

Great!