use event writer in skaffold execution

[MarlonGamez]

Related: #5370

Description
Sets up the main skaffoldWriter to also use an event writer so that output gets written on the /skaffoldLogs API endpoint as well. Also sets up some event writer contexts for build and deploy phases so that the output events can be categorized.

User facing changes (remove if N/A)
users can now hit the /skaffoldLogs endpoint to see output from skaffold being emitted as events.

Follow-up Work (remove if N/A)
Set up more calls to WithEventContext so that things are further organized.

[codecov]

Codecov Report

Merging #5965 (d43feb0) into master (7f754f6) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #5965      +/-   ##
==========================================
- Coverage   70.79%   70.78%   -0.02%     
==========================================
  Files         462      462              
  Lines       17866    17897      +31     
==========================================
+ Hits        12649    12668      +19     
- Misses       4286     4298      +12     
  Partials      931      931              

Impacted Files	Coverage Δ
pkg/skaffold/build/result.go	83.33% <0.00%> (ø)
pkg/skaffold/event/v2/event.go	79.83% <ø> (ø)
pkg/skaffold/event/v2/build.go	92.30% <33.33%> (-7.70%)	⬇️
pkg/skaffold/build/scheduler.go	92.18% <100.00%> (+0.12%)	⬆️
pkg/skaffold/deploy/deploy_mux.go	76.31% <100.00%> (+0.64%)	⬆️
pkg/skaffold/output/output.go	80.64% <100.00%> (ø)
pkg/skaffold/runner/build_deploy.go	73.11% <100.00%> (+0.29%)	⬆️
pkg/skaffold/runner/v1/deploy.go	53.46% <100.00%> (+0.46%)	⬆️
pkg/diag/validator/pod.go	1.11% <0.00%> (-0.12%)	⬇️
pkg/skaffold/deploy/status/status_check.go	70.92% <0.00%> (+0.84%)	⬆️
... and 2 more

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