add testType field to skaffold inspect tests output

[aaron-prindle]

No description provided.

[codecov]

Codecov Report

Merging #6561 (a9787c3) into main (290280e) will increase coverage by 0.04%.
The diff coverage is 58.33%.

@@            Coverage Diff             @@
##             main    #6561      +/-   ##
==========================================
+ Coverage   70.48%   70.53%   +0.04%     
==========================================
  Files         515      515              
  Lines       23150    23150              
==========================================
+ Hits        16317    16328      +11     
+ Misses       5776     5768       -8     
+ Partials     1057     1054       -3     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/cmd.go	70.68% <0.00%> (-0.38%)	⬇️
cmd/skaffold/app/cmd/flags.go	90.81% <ø> (ø)
cmd/skaffold/skaffold.go	0.00% <ø> (ø)
pkg/skaffold/build/buildpacks/logger.go	0.00% <ø> (ø)
pkg/skaffold/config/options.go	100.00% <ø> (ø)
pkg/skaffold/server/server.go	46.87% <0.00%> (-0.75%)	⬇️
pkg/skaffold/event/v2/event.go	84.22% <66.66%> (-0.37%)	⬇️
pkg/skaffold/build/buildpacks/lifecycle.go	83.59% <100.00%> (ø)
pkg/skaffold/inspect/tests/list.go	100.00% <100.00%> (ø)
pkg/skaffold/event/v2/status_check.go	85.45% <0.00%> (-14.55%)	⬇️
... and 9 more

---

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[gsquared94]

nit:
define as constants

var testTypes = struct {
    custom string
    cst string
} {
    custom: "custom",
    cst: "container-structure-test",
}

...
...

l.Tests = append(l.Tests, customTestEntry{testTypes.custom, ct})

[gsquared94]

lgtm!