Move application logs to their own endpoint for API V2

[MarlonGamez]

Fixes: #5369

Description
Changes applicationLogEvents to have their own endpoint, rather than being put out on the event endpoint.
There are some refactors here to avoid code duplication and support future code that will be similar as well.

[codecov]

Codecov Report

Merging #5868 (8bfb7a0) into master (540a4a0) will decrease coverage by 0.04%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master    #5868      +/-   ##
==========================================
- Coverage   70.84%   70.79%   -0.05%     
==========================================
  Files         447      446       -1     
  Lines       16842    16825      -17     
==========================================
- Hits        11931    11912      -19     
+ Misses       4028     4027       -1     
- Partials      883      886       +3     

Impacted Files	Coverage Δ
pkg/skaffold/server/v2/endpoints.go	42.10% <0.00%> (-1.14%)	⬇️
pkg/skaffold/event/v2/event.go	76.52% <87.50%> (-0.06%)	⬇️
pkg/skaffold/runner/v1/portforwarder.go	22.22% <0.00%> (-44.45%)	⬇️
pkg/skaffold/kubernetes/client/client.go	0.00% <0.00%> (-37.50%)	⬇️
pkg/skaffold/kubernetes/context/context.go	69.76% <0.00%> (-11.63%)	⬇️
...g/skaffold/kubernetes/portforward/pod_forwarder.go	82.00% <0.00%> (-4.28%)	⬇️
pkg/skaffold/docker/image.go	78.34% <0.00%> (-1.39%)	⬇️
pkg/skaffold/deploy/kustomize/kustomize.go	74.07% <0.00%> (-0.48%)	⬇️
pkg/skaffold/deploy/kubectl/kubectl.go	65.18% <0.00%> (-0.44%)	⬇️
pkg/skaffold/runner/v1/new.go	64.08% <0.00%> (-0.43%)	⬇️
... and 14 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 540a4a0...8bfb7a0. Read the comment docs.

[tejal29]

Assigning to myself since Nick is out this week