Emit TaskEvent protos for Test phase

[MarlonGamez]

Related: #5368

Description
Emits task event protos for test phase

Follow up work
Emit test subtask event protos

[aaron-prindle]

LGTM

[codecov]

Codecov Report

Merging #5786 (0040ce0) into master (d14f34d) will decrease coverage by 0.04%.
The diff coverage is 47.22%.

@@            Coverage Diff             @@
##           master    #5786      +/-   ##
==========================================
- Coverage   70.78%   70.73%   -0.05%     
==========================================
  Files         432      433       +1     
  Lines       16242    16273      +31     
==========================================
+ Hits        11497    11511      +14     
- Misses       3901     3912      +11     
- Partials      844      850       +6     

Impacted Files	Coverage Δ
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
pkg/skaffold/build/jib/init.go	83.05% <0.00%> (-4.45%)	⬇️
pkg/skaffold/build/jib/jib.go	69.46% <0.00%> (-1.08%)	⬇️
pkg/skaffold/util/tar.go	56.00% <0.00%> (+5.33%)	⬆️
cmd/skaffold/app/cmd/cmd.go	63.80% <50.00%> (ø)
pkg/skaffold/color/formatter.go	96.00% <50.00%> (-4.00%)	⬇️
pkg/skaffold/build/jib/jvm.go	55.55% <55.55%> (ø)
pkg/skaffold/util/term.go	52.94% <60.00%> (+10.08%)	⬆️
pkg/skaffold/runner/tester.go	100.00% <100.00%> (ø)
pkg/skaffold/docker/image.go	78.34% <0.00%> (-1.39%)	⬇️
... and 3 more

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