fix: pluralize sub-second fractions on human time

[0x2b3bfa0]

Description
This pull request fixes a silly bug where humanized time with a seconds component less than 1 doesn't get the plural for seconds as expected. Note, though, that this change is arguable as per some style guides; see https://english.stackexchange.com/q/365841/125512.

User facing changes

- 1 hour 3 minutes 0.5 second
+ 1 hour 3 minutes 0.5 seconds

[codecov]

Codecov Report

Merging #9098 (00a78b3) into main (290280e) will decrease coverage by 7.05%.
Report is 1033 commits behind head on main.
The diff coverage is 48.90%.

@@            Coverage Diff             @@
##             main    #9098      +/-   ##
==========================================
- Coverage   70.48%   63.43%   -7.05%     
==========================================
  Files         515      628     +113     
  Lines       23150    32304    +9154     
==========================================
+ Hits        16317    20492    +4175     
- Misses       5776    10251    +4475     
- Partials     1057     1561     +504     

Files Changed	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <0.00%> (ø)
... and 41 more

... and 432 files with indirect coverage changes

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